SigmaTron International (SGMA) 10-K 24 Jul 18 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Apr. 30, 2018	Jul. 20, 2018	Oct. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Apr. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	sgma
Entity Registrant Name	SIGMATRON INTERNATIONAL INC
Entity Central Index Key	915,358
Current Fiscal Year End Date	--04-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 35,764,422
Entity Common Stock, Shares Outstanding		4,230,008

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Apr. 30, 2018	Apr. 30, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 1,721,599	$ 3,493,324
Accounts receivable, less allowance for doubtful accounts of $300,000 and $100,000 at April 30, 2018 and 2017, respectively	26,638,367	26,656,871
Inventories, net	86,929,793	73,571,238
Prepaid expenses and other assets	1,948,748	2,971,087
Refundable and prepaid income taxes	1,655,409	339,791
Note receivable		887,531
Other receivables	1,135,810	1,112,071
Total current assets	120,029,726	109,031,913
PROPERTY, MACHINERY AND EQUIPMENT, NET	35,288,997	33,008,714
Intangible assets, net	3,088,085	4,213,235
Goodwill		3,222,899
Deferred income taxes	1,109,681	236,087
Other assets	1,713,481	1,472,816
Total other long-term assets	5,911,247	9,145,037
Total assets	161,229,970	151,185,664
CURRENT LIABILITIES
Trade accounts payable	49,326,402	46,160,395
Accrued expenses	2,930,792	2,322,055
Accrued wages	3,730,755	4,489,602
Income taxes payable		69,868
Current portion of long-term debt	655,190	351,562
Current portion of capital lease obligations	2,320,538	1,711,204
Current portion of contingent consideration	213,460	286,240
Current portion of deferred rent	201,349	220,288
Total current liabilities	59,378,486	55,611,214
Long-term debt, less current portion	36,783,879	27,192,246
Capital lease obligations, less current portion	4,297,846	3,364,825
Contingent consideration, less current portion		237,578
Income taxes payable	498,000
Other long-term liabilities	1,130,557	991,017
Deferred rent, less current portion	331,251	555,348
Deferred income taxes		1,361,291
Total long-term liabilities	43,041,533	33,702,305
Total liabilities	102,420,019	89,313,519
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Preferred stock, $.01 par value; 500,000 shares authorized, none issued or outstanding
Common stock, $.01 par value; 12,000,000 shares authorized, 4,215,258 and 4,195,813 shares issued and outstanding at April 30, 2018 and 2017, respectively	41,896	41,702
Capital in excess of par value	23,132,017	22,952,535
Retained earnings	35,636,038	38,877,908
Total stockholders' equity	58,809,951	61,872,145
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 161,229,970	$ 151,185,664

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Apr. 30, 2018	Apr. 30, 2017
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 300,000	$ 100,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	12,000,000	12,000,000
Common stock, shares issued	4,215,258	4,195,813
Common stock, shares outstanding	4,215,258	4,195,813

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Consolidated Statements Of Operations [Abstract]
Net sales	$ 278,131,709	$ 253,370,175
Cost of products sold	251,528,791	228,194,867
Gross profit	26,602,918	25,175,308
Selling and administrative expenses	23,089,939	21,909,110
Impairment of goodwill and intangible asset	3,913,006
Loss on settlement of receivable and disposal of related assets	2,509,423
Operating (loss) income	(2,909,450)	3,266,198
Other income	(144,574)	(367,338)
Interest expense	1,537,446	1,135,853
(Loss) income before income taxes	(4,302,322)	2,497,683
Income tax (benefit) expense	(1,060,452)	1,107,477
NET (LOSS) INCOME	$ (3,241,870)	$ 1,390,206
(Loss) earnings per common share - Basic	$ (0.77)	$ 0.33
(Loss) earnings per common share - Diluted	$ (0.77)	$ 0.33
Weighted-average shares of common stock outstanding - Basic	4,205,483	4,186,183
Weighted-average shares of common stock outstanding - Diluted	4,205,483	4,213,592

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Stockholders' Equity - USD ($)	Preferred Stock [Member]	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Total
Balance at Apr. 30, 2016		$ 41,560	$ 22,546,616	$ 37,487,702	$ 60,075,878
Recognition of stock-based compensation			332,783		332,783
Exercise of stock options		12	4,308		4,320
Vesting of restricted stock		113	60,536		60,649
Employee stock purchases		17	8,330		8,347
Excess tax expense on stock options and awards			(38)		(38)
Net (loss) income				1,390,206	1,390,206
Balance at Apr. 30, 2017		41,702	22,952,535	38,877,908	61,872,145
Recognition of stock-based compensation			83,659		83,659
Exercise of stock options		194	95,823		96,017
Net (loss) income				(3,241,870)	(3,241,870)
Balance at Apr. 30, 2018		$ 41,896	$ 23,132,017	$ 35,636,038	$ 58,809,951

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Cash flows from operating activities
Net (loss) income	$ (3,241,870)	$ 1,390,206
Adjustments to reconcile net income (loss) to net cash used in operating activities
Depreciation and amortization	5,118,297	4,708,876
Stock-based compensation	83,659	332,783
Restricted stock expense		60,649
Increase in allowance for doubtful accounts	200,000
Increase in inventory obsolescence reserve		300,000
Loss on settlement of receivable and disposal of related assets	2,509,423
Impairment of goodwill	3,222,899
Impairment of intangible asset	690,107
Deferred income tax (benefit) expense	(2,234,885)	2,641
Amortization of intangible assets	435,043	490,010
Amortization of financing fees	63,669	111,981
Fair value adjustment of contingent consideration	(84,344)	(353,591)
Loss from disposal or sale of machinery and equipment	20,011	58,456
Gain from involuntary conversion on non-monetary assets due to fire		(276,967)
Changes in assets and liabilities
Accounts receivable	(1,716,793)	(8,812,643)
Inventories	(13,415,555)	(6,222,216)
Prepaid expenses and other assets	1,761,070	(1,092,816)
Refundable and prepaid income taxes	(1,315,618)	435,056
Income taxes payable	428,132	69,868
Trade accounts payable	3,166,007	9,148,609
Deferred rent	(243,036)	(207,542)
Accrued expenses and wages	(163,300)	(197,121)
Net cash used in operating activities	(4,717,084)	(53,761)
Cash flows from investing activities
Purchases of machinery and equipment	(3,731,370)	(3,505,486)
Net cash used in investing activities	(3,731,370)	(3,505,486)
Cash flows from financing activities
Advances on notes receivable	(880,000)
Proceeds from the exercise of common stock options	96,017	4,320
Proceeds from Employee stock purchases		8,347
Proceeds under equipment note	943,136	932,812
Proceeds under sale leaseback agreements		904,027
Tax expense on stock options and awards		(38)
Payments of contingent consideration	(226,014)	(273,672)
Payments under capital lease and sale leaseback agreements	(2,144,866)	(1,610,356)
Payments under equipment note	(297,328)	(29,850)
Proceeds under building notes payable	7,000,000
Payments under building notes payable	(3,741,000)	(165,000)
Borrowings under lines of credit	15,912,446	94,123,100
Payments under lines of credit	(9,811,244)	(90,958,740)
Payments of financing fees	(174,418)	(207,647)
Net cash provided by financing activities	6,676,729	2,727,303
Change in cash	(1,771,725)	(831,944)
Cash and cash equivalents at beginning of year	3,493,324	4,325,268
Cash and cash equivalents at end of year	1,721,599	3,493,324
Supplementary disclosures of cash flow information
Cash paid for interest	1,435,067	994,583
Cash paid for income taxes	2,053,779	603,091
Purchase of machinery and equipment financed under capital leases	3,687,221	1,189,701
Financing of insurance policy	$ 152,730	$ 157,805

Description Of The Business

Description Of The Business	12 Months Ended
	Apr. 30, 2018
Description Of The Business [Abstract]
Description Of The Business	NOTE A - DESCRIP TION OF THE BUSINESS  SigmaTron International, Inc., its subsidiaries, foreign enterprises and international procurement office (collectively, the “Company”) operates in one business segment as an independent provider of electronic manufacturing services (“EMS”), which includes printed circuit board assemblies and completely assembled (box-build) electronic products. In connection with the production of assembled products, the Company also provides services to its customers, including (1) automatic and manual assembly and testing of products; (2) material sourcing and procurement; (3) manufacturing and test engineering support; (4) design services; (5) warehousing and distribution services; and (6) assistance in obtaining product approval from governmental and other regulatory bodies. As of April 30, 2018, the Company provided these manufacturing services through an international network of facilities located in the United States, Mexico, China, Vietnam and Taiwan. Approximately 14.0% of the total non-current consolidated assets of the Company are located in foreign jurisdictions outside the United States as of April 30, 2018 and 2017.

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Apr. 30, 2018
Summary Of Significant Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  Consolidation Policy  The consolidated financial statements include the accounts and transactions of SigmaTron International, Inc. (“SigmaTron”), its wholly-owned subsidiaries, Standard Components de Mexico, S.A., AbleMex S.A. de C.V., Digital Appliance Controls de Mexico, S.A. de C.V., Spitfire Controls (Vietnam) Co. Ltd., Spitfire Controls (Cayman) Co. Ltd. and SigmaTron International Trading Co., wholly-owned foreign enterprises Suzhou SigmaTron Electronics Co. Ltd., and SigmaTron Electronic Technology Co., Ltd. (collectively, “SigmaTron China”), and its international procurement office, SigmaTron Taiwan. The functional currency of the Mexican, Vietnamese and Chinese subsidiaries and procurement branch is the U.S. Dollar. Intercompany transactions are eliminated in the consolidated financial statements. The impact of currency fluctuations for the fiscal year ended April 30, 2018 resulted in net foreign currency transaction gains of approximately $125,000 compared to net foreign currency losses of $508,000 in the prior year.  Use of Estimates  The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates made in preparing the consolidated financial statements include depreciation and amortization periods, the allowance for doubtful accounts, reserves for inventory, lower of cost or market adjustment for inventory, contingent consideration, deferred taxes, uncertain tax positions, valuation allowance for deferred taxes and valuation of goodwill and long-lived assets. Actual results could materially differ from these estimates.  Cash and Cash Equivalents  Cash and cash equivalents include cash and all highly liquid short-term investments with original maturities within three months of the purchase date.   NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  Accounts Receivable  The majority of the Company’s accounts receivable are due from companies in the industrial electronics, consumer electronics and medical/life sciences industries. Credit is extended based on evaluation of a customer’s financial condition, and, generally, collateral is not required. Accounts receivable are due in accordance with agreed upon terms, and are stated at amounts due from customers net of an allowance for doubtful accounts. Accounts outstanding longer than the contractual payments terms are considered past due. The Company writes off accounts receivable when they are determined to be uncollectible.  The Company has arrangements with various financial institutions to sell certain eligible accounts receivable balances from specific customers. The accounts receivable balances sold are at the election of the Company and the Company incurred fees for such sales, which were not material for the year ended April 30, 2018 or 2017. The accounts receivable balances are derecognized at the time of sale, as the Company does not have continuing involvement after the point of sale. During the years ended April 30, 2018 and 2017, the Company sold without recourse trade receivables of approximately $78,000,000 and $95,000,000 , respectively. Cash proceeds from these agreements are reflected as operating activities included in the change in accounts receivable in the Company's consolidated statements of cash flows.  Allowance for Doubtful Accounts  The Company’s allowance for doubtful accounts relates to receivables not expected to be collected from its customers. This allowance is based on management’s assessment of specific customer balances, considering the age of receivables and financial stability of the customer and a five year average of prior uncollectible amounts. If there is an adverse change in the financial condition of the Company’s customers, or if actual defaults are higher than provided for, an addition to the allowance may be necessary.  Inventories  Inventories are valued at cost. Cost is determined by an average cost method and the Company allocates labor and overhead to work-in-process and finished goods. In the event of an inventory write-down, the Company records expense to state the inventory at lower of cost or net realizable value. The Company establishes inventory reserves for valuation, shrinkage, and excess and obsolete inventory. The Company records provisions for inventory shrinkage based on historical experience to account for unmeasured usage or loss. The Company records provisions for excess and obsolete inventories for the difference between the cost of inventory and its estimated realizable value based on assumptions about future product demand and market conditions. For convenience, the Company records these inventory reserves against the inventory cost through a contra asset rather than through a new cost basis. Upon a subsequent sale or disposal of the impaired inventory, the corresponding reserve is relieved to ensure the cost basis of the inventory reflects any reductions. Actual results differing from these estimates could significantly affect the Company’s inventories and cost of products sold as the inventory is sold or otherwise relieved.   NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  Property, Machinery and Equipment  Property, machinery and equipment are valued at cost. The Company provides for depreciation and amortization using the straight-line method over the estimated useful life of the assets:    Buildings 20 years  Machinery and equipment 5 -12 years  Office equipment and software 3 -5 years  Tools and dies 12 months  Leasehold improvements lesser of lease term or useful life  Expenses for repairs and maintenance are charged to selling and administrative expenses as incurred.  Deferred Financing Costs  Deferred financing costs consist of costs incurred to obtain the Company’s long-term debt and are amortized using the effective interest method over the term of the related debt. Deferred financing fees of $319,332 and $208,583 net of accumulated amortization of $75,585 and $11,916 , respectively, as of April 30, 2018 and 2017, respectively, are deducted from long term debt on the Company’s balance sheet.  Income Taxes  The Company’s income tax expense, deferred tax assets and liabilities and reserves for unrecognized tax benefits reflect management’s best assessment of estimated future taxes to be paid. The Company is subject to income taxes in both the U.S. and several foreign jurisdictions. Significant judgments and estimates by management are required in determining the consolidated income tax expense assessment.  Deferred income tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities, and are measured using the enacted tax rates and laws that are expected to be in effect when the differences are expected to reverse. In evaluating the Company’s ability to recover its deferred tax assets within the jurisdiction from which they arise, the Company considers all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax planning strategies and recent financial operations. In projecting future taxable income, the Company begins with historical results and changes in accounting policies, and incorporates assumptions including the amount of future state, federal and foreign pre-tax operating income, the reversal of temporary differences, and the implementation of feasible and prudent tax planning strategies. These assumptions require significant judgment and estimates by management about the forecasts of future taxable income and are consistent with the plans and estimates the Company uses to manage the underlying businesses. In evaluating the objective evidence that historical results provide, the Company considers three years of cumulative operating income and/or loss. Valuation allowances are established when necessary to reduce deferred income tax assets to an amount more likely than not to be realized.  The calculation of the Company’s tax liabilities involves dealing with uncertainties in the application of complex tax laws and regulations in a multitude of jurisdictions across its global operations. Changes in tax laws and rates could also affect recorded deferred tax assets and liabilities in the future. Except as noted below, management is not aware of any such changes that would have a material effect on the Company’s results of operations, cash flows or financial position.  A tax benefit from an uncertain tax position may only be recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on the technical merits. NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  Income Taxes - Continued  The Company adjusts its tax liabilities when its judgment changes as a result of the evaluation of new information not previously available. Due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from its current estimate of the tax liabilities. These differences will be reflected as increases or decreases to income tax expense in the period in which they are determined.  Earnings per Share  Basic earnings per share are computed by dividing net income (loss) (the numerator) by the weighted-average number of common shares outstanding (the denominator) for the period. The computation of diluted earnings per share is similar to the computation of basic earnings per share, except that the denominator is increased to include the number of additional common shares that would have been outstanding if the potentially dilutive common stock equivalents such as stock options and restricted stock, had been exercised or vested. There were 109,402 and 285,000 anti-dilutive common stock equivalents at April 30, 2018 and April 30, 2017, respectively, which have been excluded from the calculation of diluted earnings per share.     Twelve Months Ended  April 30,  2018 2017   Net (loss) income $ (3,241,870) $ 1,390,206  Weighted-average shares  Basic 4,205,483 4,186,183  Effect of dilutive stock options - 27,409   Diluted 4,205,483 4,213,592   Basic (loss) earnings per share $ (0.77) $ 0.33   Diluted (loss) earnings per share $ (0.77) $ 0.33    Revenue Recognition  Revenues from sales of the Company's electronic manufacturing services business are recognized when the finished good product is shipped to the customer. In general, and except for consignment inventory, it is the Company's policy to recognize revenue and related costs when the finished goods have been shipped from its facilities, which is also the same point in time that title passes under the terms of the purchase order and control passes to the customer. Finished goods inventory for certain customers is shipped from the Company to an independent warehouse for storage or shipped directly to the customer and stored in a segregated part of the customer’s own facility. Upon the customer’s request for finished goods inventory, the inventory is shipped to the customer if the inventory was stored off-site, or transferred from the segregated part of the customer’s facility for consumption or use by the customer. The Company recognizes revenue upon such shipment or transfer to the customer. The Company does not earn a fee for such arrangements. The Company from time to time may ship finished goods from its facilities, which is also the same point in time that title passes under the terms of the purchase order, and invoice the customer at the end of the calendar month. This is done only in special circumstances to accommodate a specific customer. Further, from time to time  NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  Revenue Recognition - Continued  customers request the Company hold finished goods after they have been invoiced to consolidate finished goods for shipping purposes. The Company generally provides a warranty for workmanship, unless the assembly was designed by the Company, in which case it warrants assembly/design. The Company does not have any installation, acceptance or sales incentives (although the Company has negotiated longer warranty terms in certain instances). The Company assembles and tests assemblies based on customers’ specifications. Historically, the amount of returns for workmanship issues has been de minimis under the Company’s standard or extended warranties.  Shipping and Handling Costs  The Company records shipping and handling costs for goods shipped to customers as selling and administrative expenses. Customers are typically invoiced for shipping costs and such amounts are included in net sales. Shipping and handling costs were not material to the financial statements for fiscal years 2018 or 2017.  Fair Value Measurements  Fair value measurements are determined based upon the exit price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants exclusive of any transaction costs. The Company utilizes a fair value hierarchy based upon the observability of inputs used in valuation techniques as follows:  Level 1: Observable inputs such as quoted prices in active markets; Level 2: Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3: Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.  Fair Value of Financial Instruments  The Company’s financial instruments include cash and cash equivalents, accounts receivable, note receivable, other receivables, accounts payable and accrued expenses which approximate fair value at April 30, 2018 and 2017, due to their short-term nature. The carrying amounts of the Company’s debt obligations approximate fair value based on future payments discounted at current interest rates for similar obligations or interest rates which fluctuate with the market.  The Company measured the contingent consideration included in the fiscal 2013 Spitfire acquisition under the fair value standard (primarily using level 3 measurement inputs). The contingent consideration continues to be measured and reported at fair value at each period end. The Company currently does not have any other non-financial assets and non-financial liabilities that are required to be measured at fair value on a recurring basis.  T he Company entered into an Asset Purchase Agreement with Wagz, Inc. (Wagz) whereby the Company sold assets to Wagz for $350,000 cash, 600,000 shares of Wagz Class C Common Stock and an earn-out based on sales by Wagz generated from use of the assets through July 31, 2022. The earn-out is $6.00 per unit of a product specified in the asset purchase agreement and any upgrade to such product. The fair value of the non-cash consideration consisted of $600,000 for the 600,000 shares of Wagz common stock which is recorded within other assets. The Company determined the fair value of the equity using the price per common share received by Wagz in a recent financing transaction, a level 3 input. The Company did not assign any value to the earn-out because any receipts from the earn-out are contingent upon Wagz selling the product specified in the asset purchase agreement between the Company and Wagz.   NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  Goodwill  Goodwill represents the purchase price in excess of the fair value of assets acquired in business combinations. Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 350, “Intangibles – Goodwill and Other,” requires the Company to assess goodwill and other indefinite-lived intangible assets for impairment at least annually in the absence of an indicator of possible impairment and immediately upon an indicator of possible impairment. The Company is permitted the option to first assess qualitative factors to determine whether the existence of events and circumstances indicates that it is more likely than not that the fair value of any reporting unit is less than its corresponding carrying value. If, after assessing the totality of events and circumstances, the Company concludes that it is not more likely than not that the fair value of any reporting unit is less than its corresponding carrying value, then the Company is not required to take further action. However, if the Company concludes otherwise, then it is required to perform a quantitative impairment test, including computing the fair value of the reporting unit and comparing that value to its carrying value (the “step 2” requirement). If the fair value is less than its carrying value, a second step of the test is required to determine if recorded goodwill is impaired. The Company also has the option to bypass the qualitative assessment for goodwill in any period and proceed directly to performing the quantitative impairment test. The Company will be able to resume performing the qualitative assessment in any subsequent period. For fiscal 2017, the Company performed its annual goodwill impairment test as of February 1, 2017 and determined no impairment existed as of that date. The step one analysis was performed using a combination of a market approach and an income approach based on a discounted cash flow analysis.  For fiscal year 2018, the Company early adopted the guidance contained in Accounting Standards Update (ASU) No. 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment,” which removes the step 2 requirement to perform a hypothetical purchase price allocation to measure goodwill impairment. Beginning with its February 1, 2018 goodwill impairment testing, goodwill impairment is the amount by which the Company’s single reporting unit carrying value exceeds its fair value, not to exceed the recorded amount of goodwill. To estimate the fair value of the Company’s equity, the Company used both a market approach based on the guideline companies’ method, and an income approach based on a discounted cash flow analysis. The value indicated by both methods was weighted to arrive at a concluded value. The carrying value of the Company’s equity was greater than the fair value of the Company based on the valuation analysis by an amount greater than the recorded amount of the goodwill. In the fourth quarter of fiscal 2018, the Company’s forecasted future cash flow declined from prior estimates. The Company is experiencing declining margins due to pricing pressures from vendors and customers. Also at this time, electronic component manufacturers began allocating components to their customers which required the Company to increase its investment in working capital. The decline in the forecasted cash flow resulted in a lower estimate of the fair value of the Company’s reporting unit causing the Company to take an impairment charge on all of its goodwill. The Company has begun taking steps to improve its margins and has negotiated an increase in its revolving credit facility to address its working capital needs. Accordingly, the Company recognized a full goodwill impairment charge of $3,222,899.  Intangible Assets  Intangible assets are comprised of finite life intangible assets including patents, trade names, backlog, non-compete agreements, and customer relationships. Finite life intangible assets are amortized on a straight line basis over their estimated useful lives of 5 years for patents, 20 years for trade names, 1 year for backlog and 7 years for non-compete agreements except for customer relationships which are amortized on an accelerated basis over their estimated useful life of 15 years.  Impairment of Long-Lived Assets  The Company reviews long-lived assets, including amortizable intangible assets, for impairment. Property, machinery and equipment and finite life intangible assets are reviewed whenever events or changes in circumstances occur that indicate possible impairment. If events or changes in circumstances occur that indicate possible impairment, the NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  Impairment of Long-Lived Assets - Continued  Company first performs an impairment review based on an undiscounted cash flow analysis at the lowest level at which cash flows of the long-lived assets are largely independent of other groups of its assets and liabilities. This analysis requires management judgment with respect to changes in technology, the continued success of product lines, and future volume, revenue and expense growth rates. If the carrying value exceeds the undiscounted cash flows, the Company records an impairment, if any, for the difference between the estimated fair value of the asset group and its carrying value. The Company further conducts annual reviews for idle and underutilized equipment, and reviews business plans for possible impairment. As a result of the analysis performed in the fourth quarter of fiscal 2018, the Company determined that the carrying value of the trade name intangible asset was not recoverable and recorded a charge of $690,107 for the entire carrying amount. The Company’s analysis did not indicate that any of its other long-lived assets were impaired.  Settlement of Receivable, Related Sale of Assets and Investments  As more fully described in Note E – Related Parties, the Company has recorded an investment in Wagz, a privately held company whose equity does not have a readily determinable fair value. As permitted by ASC 321, Investments - Equity Securities, paragraph 321-35-2, the Company has elected to carry its investment in Wagz equity at its cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or a similar investment of the same issuer until the investment no longer qualifies to be measured under paragraph 321-35-2. The balance at fiscal year ended April 30, 2018 was $600,000 which is recorded under other assets. For the fiscal year ended April 30, 2018, the Company has not recognized any impairment of this investment.  Stock Incentive Plans  Under the Company’s stock option plans, options to acquire shares of common stock have been made available for grant to certain employees and directors. Each option granted has an exercise price of not less than 100% of the market value of the common stock on the date of grant. The contractual life of each option is generally 10 years. The vesting of the grants varies according to the individual options granted. The Company measures the cost of employee services received in exchange for an equity award based on the grant date fair value and records that cost over the respective vesting period of the award.  Reclassifications  Certain reclassifications have been made to the previously reported 2017 financial statements to conform to the 2018 presentation. There was no change to net income.  New Accounting Standards  In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, "Revenue from Contracts with Customers" (Topic 606) which supersedes the revenue recognition requirements in ASC 605, “ Revenue Recognition” . In summary, the core principle of this standard, along with various subsequent amendments, is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additionally, the new standard requires enhanced disclosures about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts, including revenue recognition policies to identify performance obligations, assets recognized from costs incurred to obtain and fulfill a contract, and significant judgments in measurements and recognition. The standard, as amended, was effective for annual periods beginning after December 15, 2017, including interim periods within that reporting period. Companies have the option of using either a full or modified retrospective approach in applying this standard.  NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  New Accounting Standards – Continued  To plan for the adoption of the standard, the Company conducted an analysis to determine the impact the new standard would have on its consolidated financial statements. This analysis included reviewing 1) contract terms and existing accounting policies to determine the financial impact of the standard, 2) data availability and system reports to meet the additional disclosure requirements of the standard, 3) any practical expedients the Company could elect upon adoption and 4) the control environment and internal processes to ensure the appropriate controls are in place. As part of implementation efforts we reviewed and modified our standard manufacturing agreement and invoice terms and conditions to emphasize that title, risk of loss and control of the finished goods products we sell transfers to our customers upon shipment.  The Company adopted the ASU on May 1, 2018 using the modified retrospective transition method, applying the guidance to those contracts which were not completed as of that date. The Company’s adoption of ASC 606 did not result in any changes in accounting requiring a transition adjustment to retained earnings.  Pursuant to the Company’s adoption of the standard, it is in the process of expanding its disclosures in the consolidated financial statements for revenue recognition, assets and liabilities relating to contracts with customers, the nature of the Company’s performance obligations and the manner by which the Company determines and allocates transaction prices to its performance obligations, and the significant judgments inherent in its revenue recognition policies. The Company also is in the process of implementing enhancements to its internal controls to support the Company’s ability to sustain compliance with the standard after adoption.  In February 2016, the FASB issued ASU No. 2016-02, “ Leases” . The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for capital leases and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. While the Company is still evaluating the impact of its pending adoption of the new standard on its consolidated financial statements, the Company expects that upon adoption in the fiscal year ending April 30, 2020, it will recognize ROU assets and lease liabilities and the amounts could be material.  In March 2016, the FASB issued ASU No. 2016-09, “ Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting”, a new accounting standard update intended to simplify several aspects of the accounting for share-based payment transactions including: income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. Specifically, the update requires that excess tax benefits and tax deficiencies (the difference between the deduction for tax purposes and the compensation cost recognized for financial reporting purposes) be recognized as income tax expense or benefit in the consolidated statements of operations, introducing a new element of volatility to the provision for income taxes. This update is effective for fiscal years beginning after December 15, 2016. Early adoption is permitted. The Company adopted the ASU on May 1, 2017. Effective with the adoption of the ASU all share-based awards continue to be accounted for as equity awards, excess tax benefits recognized on stock-based compensation expense are reflected in the consolidated statements of operations as a component of the provision for income taxes on a prospective basis, excess tax benefits recognized on stock-based compensation expense are classified as an operating activity in the consolidated statements of cash flows on a prospective basis and the Company has elected to continue to estimate expected forfeitures over the course of a vesting period. The adoption of the ASU had no material impact on the retained earnings, other components of equity or net assets as of the beginning of the period of adoption. NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  New Accounting Standards - Continued  In June 2016, the FASB issued ASU No. 2016-13, “ Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments .” ASU 2016-13 introduces a new forward-looking approach, based on expected losses, to estimate credit losses on certain types of financial instruments, including trade receivables. The estimate of expected credit losses will require entities to incorporate considerations of historical information, current information and reasonable and supportable forecasts. This ASU also expands the disclosure requirements to enable users of financial statements to understand the entity’s assumptions, models and methods for estimating expected credit losses. For public business entities, ASU 2016-13 is effective for annual and interim reporting periods beginning after December 15, 2019, and the guidance is to be applied using the modified-retrospective approach. Earlier adoption is permitted for annual and interim reporting periods beginning after December 15, 2018. The Company is currently evaluating the new guidance and has not determined the impact this ASU may have on its consolidated financial statements.  In August 2016, the FASB issued ASU Update No. 2016-15, “Statement of Cash Flows- Classification of Certain Cash Receipts and Cash Payments, ” which is intended to reduce diversity in practice in how certain transactions are classified in the statements of cash flows. This update will be effective for fiscal years beginning after December 15, 2017 (the Company’s fiscal year ending April 30, 2019), and interim periods within those fiscal years. Early adoption is permitted, provided that all of the amendments are adopted in the same period. The guidance requires application using a retrospective transition method. The Company plans to adopt the ASU in its fiscal year ending April 30, 2019. The Company does not expect the impact of the adoption of this ASU to have a material impact on the Company’s consolidated statements of cash flows.  In January 2017, the FASB issued ASU No. 2017-04, “ Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment ,” which removes the step 2 requirement to perform a hypothetical purchase price allocation to measure goodwill impairment. Goodwill impairment will now be the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the recorded amount of goodwill. This guidance is effective for public companies for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019, and early adoption is permitted. The Company early adopted this guidance in the third quarter of its fiscal year ending April 30, 2018 and is applying this guidance to all future tests.  In January 2017, the FASB issued ASU No. 2017-01, “ Business Combinations (Topic 805): Clarifying the Definition of a Business ,” which clarifies the definition of a business when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. For public companies, this ASU is effective for annual periods beginning after December 15, 2017, inc

Allowance For Doubtful Accounts

Allowance For Doubtful Accounts	12 Months Ended
	Apr. 30, 2018
Allowance For Doubtful Accounts [Abstract]
Allowance For Doubtful Accounts	NOTE C - ALLOWANCE FOR DOUBTFUL ACCOUNTS  Changes in the Company’s allowance for doubtful accounts are as follows:    2018 2017  Beginning Balance $ 100,000 $ 100,000  Bad debt expense 200,000 -  Write-offs - -  $ 300,000 $ 100,000  

Inventories

Inventories	12 Months Ended
	Apr. 30, 2018
Inventories [Abstract]
Inventories	NOTE D - INVENTORIES  Inventories consist of the following at April 30:    2018 2017   Finished products $ 20,404,849 $ 20,291,768  Work-in-process 2,075,465 1,795,852  Raw materials 65,652,411 52,748,542  88,132,725 74,836,162  Less obsolescence reserve 1,202,932 1,264,924  $ 86,929,793 $ 73,571,238  Changes in the Company’s inventory obsolescence reserve are as follows:    2018 2017   Beginning balance $ 1,264,924 $ 1,212,532  Provision for obsolescence - 300,000  Write-offs (61,992) (247,608)  $ 1,202,932 $ 1,264,924 

Related Parties

Related Parties	12 Months Ended
	Apr. 30, 2018
Related Parties [Abstract]
Related Parties	NOTE E - RELATED PARTIES  In March, 2015, two of the Company’s executive officers invested in a start-up customer, Petzila, Inc. (“Petzila”). The executive officers’ investments constituted less than 2% (individually and in aggregate) of the outstanding beneficial ownership of Petzila, according to information provided by Petzila to the executive officers. As of April 2018, Petzila owed the Company approximately $3,652,800 , consisting of an outstanding note receivable of $2,117,500 and account receivable of $1,535,300 , compared to an outstanding note receivable and account receivable of approximately $888,000 and $1,271,000 , respectively, at April 30, 2017. As of April 2018, inventory on hand related to this customer approximated $211,000 compared to $310,000 at April 30, 2017. Sales to this customer have not been material for fiscal year 2018 or 2017.  On January 29, 2016, the Company entered into a memorandum of understanding with Petzila. Under the subsequent agreement, effective January 29, 2016, the then outstanding account receivable of approximately $888,000 was converted into a short-term promissory note. The promissory note bore interest at the rate of 8% per annum, payable at the maturity of the promissory note. The promissory note was scheduled to mature at the earlier of October 31, 2016 , or within 10 days after the customer obtains certain equity financing, or at the closing of a sale of substantially all of Petzila’s stock or assets. As additional consideration, the Company received warrants under the agreement. The warrants were ten years in duration and at an exercise price of $0.01 per share and for a number of shares determined pursuant to the warrant, expected to be, at a minimum, approximately 1% of Petzila’s then - outstanding equity securities. The Company believed the warrants had nil value. Further, the Company was granted a security interest in Petzila’s accounts receivable and authority to access and be a signatory on its deposit accounts.  On December 6, 2016, the Company extended the maturity of the promissory note to July 31, 2017 . The promissory note continued to bear interest at the rate of 8% per annum, payable monthly. As consideration, the Company received additional warrants under the agreement, which the Company believed had nil value.  On August 25, 2017, effective as of July 31, 2017, the Company and Petzila entered into a new forbearance agreement. The Company agreed to extend the maturity of the promissory note and forbear exercising its remedies until the earliest of a capital raise, the sale of Petzila, or October 31, 2017, and to fund Petzila’s operations while Petzila explored its options by advancing a maximum of $315,000 through October 31, 2017, pursuant to a new promissory note that bore interest at 8% per annum. Additionally, should Petzila’s business be sold at a price exceeding $5,000,000 and the amount necessary to pay its creditors, the Company would receive a fee in addition to the debt owed to the Company. The forbearance period and maturity date of the notes were set to expire on the earliest of a capital raise, the sale of Petzila or October 31, 2017, but the Company had a unilateral right to extend the forbearance period and maturity of the notes and to make additional advances and did so as discussed further below.  The Company’s right to receive the sale fee was an embedded derivative to the note receivable, which was required to be separated for accounting purposes. On July 31, 2017, the fair values of the new instruments received were as follows: note receivable $887,531 , warrants $0 and embedded derivative $0 . After their initial recording at fair value, the note receivable and warrants were recorded at amortized cost. The embedded derivative will be recorded at fair value at each reporting period, with changes in value recognized as a gain or loss in the consolidated statement of operations. There was no gain or loss on the extinguishment, as the pre and post extinguishment fair values were consistent and there were no capitalized costs related to the extinguished instruments to expense.  During the time from November l, 2017 through February 28, 2018, Petzila prepared and distributed a confidential information memorandum to potential buyers of its business, negotiated with interested buyers, and participated in due diligence. During that time, in an effort to enhance its secured position, the Company continued to provide working capital of $105,000 each month and extended on a monthly basis the forbearance period and maturity of the notes. Petzila continued with its efforts to negotiate a sale of its business to a third party. NOTE E - RELATED PARTIES - Continued  During the time from March 1, 2018 through April 30, 2018, the Company continued to provide working capital of $145,000 . Petzila continued with its efforts to negotiate a sale of its business to a third party.  On April 30, 2018 the Company foreclosed on its security interest and held a public sale of the assets in accordance with the requirements of Article 9 of the California Uniform Commercial Code. The Company acquired all of the assets of Petzila as the winning bidder at the public sale by a credit bid of $3,500,000 , the aggregate amount of Petzila’s liability to the company.  Concurrent with the foreclosure sale, the Company entered into an Asset Purchase Agreement with Wagz, Inc. (Wagz) whereby the Company sold the assets to Wagz for $350,000 cash, 600,000 shares of Wagz common stock and an earn-out based on sales by Wagz generated from use of the assets through July 31, 2022 . The earn-out is $6.00 per unit of a product specified in the asset purchase agreement and any upgrade to such product.  Accordingly, the Company recognized the fair value of the assets received from Wagz and derecognized the receivables from Petzila. The fair value of the assets received from Wagz was approximately $950,000 ; therefore, the Company recognized a loss of approximately $2,509,423 in its consolidated statement of operations for the year ended April 30, 2018.  The fair value of the non-cash consideration consisted of $600,000 for the 600,000 shares of Wagz common stock which is recorded within other assets. The Company determined the fair value of the equity using the price per common share received by Wagz in a recent financing transaction, a level 3 input. The Company did not assign any value to the earn-out because any receipts from the earn-out are highly uncertain and contingent upon Wagz selling the product specified in the asset purchase agreement between the Company and Wagz.   

Property, Machinery And Equipme

Property, Machinery And Equipment, Net	12 Months Ended
	Apr. 30, 2018
Property, Machinery And Equipment, Net [Abstract]
Property, Machinery And Equipment, Net	NOTE F - PROPERTY, MACHINERY AND EQUIPMENT, NET  Property, machinery and equipment consist of the following at April 30:     2018 2017   Land and buildings $ 17,072,098 $ 16,969,769  Machinery and equipment 61,746,650 59,795,532  Office equipment and software 10,670,918 9,601,149  Leasehold improvements 2,673,100 2,622,870  Equipment under capital leases 12,417,034 8,752,613   104,579,800 97,741,933   Less accumulated depreciation  and amortization, including  amortization of assets under  capital leases of $3,072,310  and $2,093,544 at April 30,  2018 and 2017, respectively 69,290,803 64,733,219   Property, machinery and  equipment, net  $ 35,288,997 $ 33,008,714  Depreciation and amortization expense of property, machinery and equipment was $5,118,297 and $4,708,876 for the years ended April 30, 2018 and 2017, respectively.

Goodwill And Intangible Assets

Goodwill And Intangible Assets	12 Months Ended
	Apr. 30, 2018
Goodwill And Intangible Assets [Abstract]
Goodwill And Intangible Assets	NOTE G - GOODWILL AND INTANGIBLE ASSETS  Goodwill  The carrying amount of tax deductible goodwill for the fiscal years ended April 30, 2018 and 2017 is as follows:     2018 2017  Beginning balance $ 3,222,899 $ 3,222,899  Impairment (3,222,899) -  Ending balance $ - $ 3,222,899  Intangible Assets  Intangible assets subject to amortization are summarized as of April 30, 2018 as follows:    Weighted Average  Remaining Gross  Amortization Carrying Accumulated  Period (Years) Amount Amortization   Other intangible assets – Able - $ 375,000 $ 375,000  Customer relationships – Able - 2,395,000 2,395,000  Spitfire:  Non-contractual customer relationships 9.08 4,690,000 1,609,670  Backlog - 22,000 22,000  Trade names 14.08 - -  Non-compete agreements 1.08 50,000 42,245  Patents - 400,000 400,000  Total $ 7,932,000 $ 4,843,915  For fiscal year 2018, the Company early adopted the guidance contained in Accounting Standards Update (ASU) No. 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment,” which removes the step 2 requirement to perform a hypothetical purchase price allocation to measure goodwill impairment. Beginning with its February 1, 2018 goodwill impairment testing, goodwill impairment is the amount by which the Company’s single reporting unit carrying value exceeds its fair value, not to exceed the recorded amount of goodwill. To estimate the fair value of the Company’s equity, the Company used both a market approach based on the guideline companies’ method, and an income approach based on a discounted cash flow analysis. The value indicated by both methods was weighted to arrive at a concluded value. The carrying value of the Company’s equity was greater than the fair value of the Company based on the valuation analysis by an amount greater than the recorded amount of the goodwill. In the fourth quarter of fiscal 2018, the Company’s forecasted future cash flow declined from prior estimates. The Company is experiencing declining margins due to pricing pressures from vendors and customers. Also at this time, electronic component manufacturers began allocating components to their customers which required the Company to increase its investment in working capital. The decline in the forecasted cash flow resulted in a lower estimate of the fair value of the Company’s reporting unit causing the Company to take an impairment charge on all of its goodwill. The Company has begun taking steps to improve its margins and has negotiated an increase in its revolving credit facility to address its working capital needs. Accordingly, the Company recognized a full goodwill impairment charge of $3,222,899. NOTE G - GOODWILL AND INTANGIBLE ASSETS - Continued  Intangible Assets - Continued  The Company reviews long-lived assets, including amortizable intangible assets, for impairment. Property, machinery and equipment and finite life intangible assets are reviewed whenever events or changes in circumstances occur that indicate possible impairment. If events or changes in circumstances occur that indicate possible impairment, the Company first performs an impairment review based on an undiscounted cash flow analysis at the lowest level at which cash flows of the long-lived assets are largely independent of other groups of its assets and liabilities. This analysis requires management judgment with respect to changes in technology, the continued success of product lines, and future volume, revenue and expense growth rates. If the carrying value exceeds the undiscounted cash flows, the Company records an impairment, if any, for the difference between the estimated fair value of the asset group and its carrying value. The Company further conducts annual reviews for idle and underutilized equipment, and reviews business plans for possible impairment. As a result of the analysis performed in the fourth quarter of fiscal 2018, the Company determined that the carrying value of the trade name intangible asset was not recoverable and recorded a charge of $690,107 for the entire carrying amount. The Company’s analysis did not indicate that any of its other long-lived assets were impaired.  Intangible assets subject to amortization are summarized as of April 30, 2017 as follows:    Weighted Average  Remaining Gross  Amortization Carrying Accumulated  Period (Years) Amount Amortization   Other intangible assets – Able - $ 375,000 $ 375,000  Customer relationships – Able - 2,395,000 2,395,000  Spitfire:  Non-contractual customer relationships 10.08 4,690,000 1,237,410  Backlog - 22,000 22,000  Trade names 15.08 980,000 240,897  Non-compete agreements 2.08 50,000 35,105  Patents 0.08 400,000 393,353  Total $ 8,912,000 $ 4,698,765  Estimated aggregate amortization expense for the Company’s intangible assets, which become fully amortized in 2032, for the remaining fiscal years is as follows:    For the fiscal year ending April 30:  2019 $ 374,725  2020 362,410  2021 354,203  2022 346,582  2023 339,128  Thereafter 1,311,037  $ 3,088,085 NOTE G - GOODWILL AND INTANGIBLE ASSETS - Continued  Intangible Assets - Continued  Amortization expense was $435,043 and $490,010 for the years ended April 30, 2018 and 2017, respectively.  In conjunction with the May 2012 acquisition of Spitfire, an estimate of the fair value of the contingent consideration, $2,320,000 , was recorded based on expected operating results through fiscal 2019 and the specific terms of when such consideration would be earned. Those terms provide for additional consideration to be paid based on a percentage of sales and pre-tax profits over those years in excess of certain minimums. Payments are made quarterly each year and adjusted after each year-end audit. The Company decreased the estimated remaining payments expected to be paid under the agreement, which resulted in a decrease of $353,591 and $84,344 to the contingent consideration liability for the fiscal years ended April 30, 2018 and 2017, respectively. Any change in the Company’s estimate is reflected as a change in the contingent consideration liability and as additional charges or credits to selling and administrative expenses. The Company made payments totaling $226,014 and $273,672 for the years ended April 30, 2018 and 2017, respectively. As of April 30, 2018, the contingent consideration liability was $213,460 compared to $523,818 at April 30, 2017.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Apr. 30, 2018
Long-Term Debt [Abstract]
Long-Term Debt	NOTE H - LONG-TERM DEBT  Note Payable - Bank  Prior to March 31, 2017 the Company had a senior secured credit facility with Wells Fargo, N.A. with a revolving credit limit up to $30,000,000 . The credit facility was collateralized by substantially all of the Company’s domestically located assets and the Company had pledged 65% of its equity ownership interest in some of its foreign entities. Prior to its payoff and termination, the Wells Fargo, N.A. senior secured credit facility was due to expire on October 31, 2018 . On March 31, 2017, the Company paid the balance outstanding under the senior revolving credit facility in the amount of $22,232,914 . The remaining deferred financing costs of $68,475 were expensed in the fourth quarter of fiscal 2017.  On March 31, 2017, the Company entered into a $35,000,000 senior secured credit facility with U.S. Bank, National Association (“U.S. Bank”), which expires on March 31, 2022 . The credit facility is collateralized by substantially all of the Company’s domestically located assets. The facility allows the Company to choose among interest rates at which it may borrow funds: the bank fixed rate of four percent or LIBOR plus one and one half percent (effectively 3.83% at April 30, 2018). Interest is due monthly. Under the senior secured credit facility, the Company may borrow up to the lesser of (i) $35,000,000 or (ii) an amount equal to a percentage of the eligible receivable borrowing base plus a percentage of the eligible inventory borrowing base (the “Borrowing Base”). Deferred financing costs of $34,971 and $207,647 were capitalized in the twelve month period ending April 30, 2018 and the fourth quarter of fiscal 2017, respectively, which are amortized over the term of the agreement. As of April 30, 2018 and April 30, 2017 the unamortized amount included in other assets was $192,502 and $204,186 , respectively. As of April 30, 2018, there was $29,279,631 outstanding and $5,720,369 of unused availability under the U.S. Bank facility compared to an outstanding balance of $23,178,429 and $11,821,571 of unused availability at April 30, 2017. At April 30, 2018, the Company was in compliance with its financial covenant and other restricted covenants under the credit facility.  On July 16, 2018, the Company and U.S. Bank entered into an amendment of the revolving credit facility. The amended revolving credit facility allows the Company to borrow up to the lesser of (i) $45,000,000 less reserves or (ii) 90% of the Company’s Borrowing Base, except that the 90% limitation will expire if the Company’s actual revolving loans for the first 90 days after the amendment’s effective date are less than 80% of the Company’s Borrowing Base and the Company maintains a Fixed Charge Coverage Ratio of 1.2 to 1.0 for four consecutive quarters. The amendment also imposes sublimits on categories of inventory equal to $17,500,000 on raw materials and $25,000,000 on finished goods. NOTE H - LONG-TERM DEBT - Continued  Note Payable - Bank - Continued  On August 4, 2015, the Company’s wholly-owned subsidiary, Wujiang SigmaTron Electronics Co., Ltd., entered into a credit facility with China Construction Bank. Under the agreement Wujiang SigmaTron Electronics Co., Ltd. could borrow up to 5,000,000 Renminbi and the facility was collateralized by Wujiang SigmaTron Electronics Co., Ltd.’s manufacturing building. Interest was payable monthly and the facility had a fixed interest rate of 6.67% . The facility was due to expire on August 3, 2017 . The credit facility was closed as of March 1, 2017 .  On March 24, 2017, the Company’s wholly-owned subsidiary, SigmaTron Electronic Technology Co., Ltd., entered into a credit facility with China Construction Bank. Under the agreement SigmaTron Electronic Technology Co., Ltd. could borrow up to 9,000,000 Renminbi and the facility was collateralized by Wujiang SigmaTron Electronics Co., Ltd.’s manufacturing building. Interest was payable monthly and the facility had a fixed interest rate of 6.09% . The term of the facility extended to February 7, 2018 . The credit facility was closed as of February 11, 2018 . There was no outstanding balance under the facility at April 30, 2017.  On February 12, 2018, the Company’s wholly-owned subsidiary, SigmaTron Electronic Technology Co., Ltd., entered into a credit facility with China Construction Bank. Under the agreement SigmaTron Electronic Technology Co., Ltd. can borrow up to 5,000,000 Renminbi and the facility is collateralized by Wujiang SigmaTron Electronics Co., Ltd.’s manufacturing building. Interest is payable monthly and the facility bears a fixed interest rate of 6.09% . The term of the facility extends to February 7, 2019 . There was no outstanding balance under the facility at April 30, 2018. Notes Payable - Buildings  The Company entered into a mortgage agreement on January 8, 2010, in the amount of $2,500,000 , with Wells Fargo, N.A. to refinance the property that serves as the Company’s corporate headquarters and its Illinois manufacturing facility. On November 24, 2014, the Company refinanced the mortgage agreement with Wells Fargo, N.A. The note required the Company to pay monthly principal payments in the amount of $9,500 , bore an interest rate of LIBOR plus two and one-quarter percent and was payable over a sixty month period. A final payment of approximately $2,289,500 was due on or before November 8, 2019 . On December 21, 2017, the Company repaid its Wells Fargo, N.A. mortgage agreement for the remaining amount outstanding of $2,498,500 , using proceeds from the U.S. Bank mortgage agreement. The outstanding balance was $2,574,500 at April 30, 2017.  The Company entered into a mortgage agreement on December 21, 2017, in the amount of $5,200,000 , with U.S. Bank to refinance the property that serves as the Company’s corporate headquarters and its Illinois manufacturing facility. The note requires the Company to pay monthly principal payments in the amount of $17,333 , bears interest at a fixed rate of 4.0% per year and is payable over a fifty-one month period. Deferred financing costs of $74,066 were capitalized in fiscal year 2018 which are amortized over the term of the agreement. As of April 30, 2018 the unamortized amount included in other assets was $66,945 . A final payment of approximately $4,347,778 is due on or before March 31, 2022 . The outstanding balance was $5,148,000 at April 30, 2018.  The Company entered into a mortgage agreement on October 24, 2013, in the amount of $1,275,000 , with Wells Fargo, N.A. to finance the property that serves as the Company’s engineering and design center in Elgin, Illinois. The Wells Fargo, N.A. note required the Company to pay monthly principal payments in the amount of $4,250 , bore interest at a fixed rate of 4.5% per year and was payable over a sixty month period. A final payment of approximately $1,030,000 was due on or before October 2018 . On December 21, 2017, the Company repaid its Wells Fargo, N.A. mortgage agreement for the remaining amount outstanding of $1,062,500 , using proceeds from the U.S. Bank mortgage agreement. The outstanding balance was $1,096,500 at April 30, 2017. NOTE H - LONG-TERM DEBT - Continued  Notes Payable - Buildings - Continued  The Company entered into a mortgage agreement on December 21, 2017, in the amount of $1,800,000 , with U.S. Bank to refinance the property that serves as the Company’s engineering and design center in Elgin, Illinois. The note requires the Company to pay monthly principal payments in the amount of $6,000 , bears interest at a fixed rate of 4.0% per year and is payable over a fifty-one month period. Deferred financing costs of $65,381 were capitalized in the fiscal year 2018 which are amortized over the term of the agreement. As of April 30, 2018 the unamortized amount included in other assets was $59,094 . A final payment of approximately $1,505,000 is due on or before March 31, 2022 . The outstanding balance was $1,782,000 at April 30, 2018.  Notes Payable - Equipment  On November 1, 2016, the Company entered into a secured note agreement with Engencap Fin S.A. DE C.V. to finance the purchase of equipment in the amount of $596,987 . The term of the agreement extends to November 1, 2021 with average quarterly payments of $35,060 beginning on February 1, 2017 and a fixed interest rate of 6.65% . The balance outstanding under this note agreement was $447,741 and $567,138 at April 30, 2018 and April 30, 2017, respectively.  On February 1, 2017, the Company entered into a secured note agreement with Engencap Fin S.A. DE C.V. to finance the purchase of equipment in the amount of $335,825 . The term of the agreement extends to February 1, 2022 with average quarterly payments of $20,031 beginning on May 1, 2017 and a fixed interest rate of 7.35% . The balance outstanding under this note agreement was $268,660 and $335,825 at April 30, 2018 and April 30, 2017, respectively.  On June 1, 2017, the Company entered into a secured note agreement with Engencap Fin S.A. DE C.V. to finance the purchase of equipment in the amount of $636,100 . The term of the agreement extends to June 1, 2022 with average quarterly payments of $37,941 beginning on September 1, 2017 and a fixed interest rate of 7.35% . The balance outstanding under this note agreement was $540,685 at April 30, 2018.  On October 1, 2017, the Company entered into a secured note agreement with Engencap Fin S.A. DE C.V. to finance the purchase of equipment in the amount of $307,036 . The term of the agreement extends to November 1, 2022 with average quarterly payments of $18,314 beginning on February 1, 2018 and a fixed interest rate of 7.35% . The balance outstanding under this note agreement was $291,684 at April 30, 2018. Capital Lease and Sale Leaseback Obligations  From October 2013 through June 2017, the Company entered into various capital lease and sales leaseback agreements with Associated Bank, National Association to purchase equipment totaling $6,893,596 . The terms of the lease agreements extend to September 2018 through May 2022 with monthly installment payments ranging from $1,455 to $40,173 and a fixed interest rate ranging from 3.75% to 4.90% . The balance outstanding under these capital lease agreements was $2,923,524 and $3,627,760 at April 30, 2018 and April 30, 2017, respectively. The net book value of the equipment under these leases was $4,799,827 and $4,713,044 at April 30, 2018 and April 30, 2017, respectively.  From April 2014 through July 2015, the Company entered into various capital lease agreements with CIT Finance LLC to purchase equipment totaling $2,512,051 . The terms of the lease agreements extend to March 2019 through July 2020 with monthly installment payments ranging from $1,931 to $12,764 and a fixed interest rate ranging from 5.65% through 6.50% . The balance outstanding under these capital lease agreements was $984,031 and $1,448,269 at April 30, 2018 and April 30, 2017, respectively. The net book value of the equipment under these leases was $1,736,688 and $1,946,026 at April 30, 2018 and April 30, 2017, respectively.  NOTE H - LONG-TERM DEBT - Continued  Capital Lease and Sale Leaseback Obligations - Continued  From September 2017 through April 2018, the Company entered into various capital lease and sales leaseback agreements with First American Equipment Finance to purchase equipment totaling $3,011,387 . The terms of the lease agreements extend to August 2021 through April 2022 with monthly installment payments ranging from $6,716 to $20,093 and a fixed interest rate ranging from 5.82% through 7.23% . The balance outstanding under these capital lease agreements was $2,688,029 at April 30, 2018. The net book value of the equipment under these leases was $2,808,209 at April 30, 2018.  The aggregate amount of debt, net of deferred financing fees, maturing in each of the following fiscal years and thereafter is as follows:   Fiscal Year Total   2019 $ 655,190  2020 655,190  2021 655,190  2022 35,473,499  $ 37,439,069   See Note M - Leases, Page F-35 for future maturities under capital lease obligations.  Other Long-Term Liabilities  As of April 30, 2018 and 2017, the Company had recorded $1,130, 557 and $991, 017 , respectively, for seniority premiums and retirement accounts related to benefits for employees, $1,052,082 and $913,827 of which, respectively, are for the Company’s foreign subsidiaries.

Accrued Expenses And Wages

Accrued Expenses And Wages	12 Months Ended
	Apr. 30, 2018
Accrued Expenses And Wages [Abstract]
Accrued Expenses And Wages	NOTE I - ACCRUED EXPENSES AND WAGES  Accrued expenses consist of the following at April 30:      2018 2017   Interest $ 121,845 $ 90,639  Commissions 187,936 143,738  Professional fees 322,377 419,801  Other - Purchases 156,634 117,069  Other 2,142,000 1,550,808   $ 2,930,792 $ 2,322,055    Accrued wages consist of the following at April 30:     2018 2017   Wages $ 1,945,142 $ 1,785,078  Bonuses 467,306 819,207  Foreign wages 1,318,307 1,885,317   $ 3,730,755 $ 4,489,602 

Income Tax

Income Tax	12 Months Ended
	Apr. 30, 2018
Income Tax [Abstract]
Income Tax	NOTE J - INCOME TAX  U.S. and foreign (loss) income before income tax (benefit) expense for the years ended April 30 are as follows:     2018 2017   Domestic $ (5,906,596) $ 1,326,266  Foreign 1,604,274 1,171,417   $ (4,302,322) $ 2,497,683  Income Tax Provision  The income tax (benefit) expense for the years ended April 30 consists of the following:     2018 2017   Current  Federal $ 433,291 $ 501,226  State 28,296 13,697  Foreign 712,846 589,913  Total Current 1,174,433 1,104,836   Deferred  Federal (1,551,921) (54,213)  State (240,647) 59,884  Foreign (442,317) (3,030)  Total Deferred (2,234,885) 2,641   Income tax $ (1,060,452) $ 1,107,477    NOTE J - INCOME TAX - Continued  Income Tax Provision - Continued  The difference between the income tax (benefit) expense and the amounts computed by applying the statutory Federal income tax rates to income before tax expense for the years ended April 30 are as follows:     2018 2017   U.S Federal Provision:  At statutory rate $ (1,325,872) $ 849,215  State taxes (151,508) 42,643  Change in valuation allowance - 78,100  Foreign tax differential 60,302 (89,885)  Impact of state tax rate change 3,670 5,920  Impact of foreign permanent items 23,106 7,171  Tax law changes 581,222 28,599  Foreign currency exchange gain/loss (172,062) 328,239  Foreign inflation adjustment (129,227) (61,707)  Stock based compensation 49,917 (80,818)   Provision for income taxes $ (1,060,452) $ 1,107,477     NOTE J - INCOME TAX - Continued  Deferred Tax Assets and Liabilities  Deferred income taxes reflect the net tax effects of loss and credit carryforwards and temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the deferred tax assets and liabilities for federal, state and foreign income taxes are as follows:     2018 2017   Deferred Tax Assets  Federal, foreign & state NOL carryforwards $ 730,561 $ 29,168  Foreign tax credit 78,100 78,100  Reserves and accruals 598,364 723,313  Stock based compensation 314,221 462,156  Inventory 869,471 1,177,067  Other intangibles 834,512 206,736  Deferred rent 114,171 211,509  Allowance for doubtful accounts 76,500 38,360  Other DTA - 13,839  Federal benefit of state - 45,589  Total Gross Deferred Tax Assets 3,615,900 2,985,837  Less: Valuation allowance (78,100) (78,100)   Net Deferred Tax Assets $ 3,537,800 $ 2,907,737   Deferred Tax Liabilities  Other assets $ (3,485) $ (318,830)  Property, machinery & equipment (2,198,332) (3,441,393)  Prepaids (203,924) (272,718)  Federal benefit of state (22,378) -  Total Deferred Tax Liabilities $ (2,428,119) $ (4,032,941)   Net Deferred Tax Asset (Liability) $ 1,109,681 $ (1,125,204)  On December 22, 2017, the U.S. Government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the Tax Act). The Tax Act makes broad and complex changes to the U.S. tax code, including, but not limited to: (1) reducing the U.S. federal corporate tax rate from 35% to 21% ; (2) changing rules related to uses and limitations of net operating loss carryforwards created in tax years beginning after December 31, 2017; (3) bonus depreciation that will allow for full expensing of qualified property; (4) creating a new limitation on deductible interest expense; (5) eliminating the corporate alternative minimum tax; and (6) new tax rules related to foreign operations.  Due to the Tax Act, the SEC staff issued Staff Accounting Bulletin 118 (“SAB 118”), which provides guidance on accounting for the tax effects of the Tax Act. SAB 118 provides a measurement period that should not extend beyond NOTE J - INCOME TAX - Continued  Deferred Tax Assets and Liabilities - Continued  one year from the Tax Act enactment date for companies to complete the accounting under ASC 740. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act.  Due to the timing of the enactment and the complexity involved in applying the provisions of the Tax Act, the Company has made reasonable estimates for certain effects of the Tax Act and recorded provisional amounts in its financial statements as of April 30, 2018. As the Company collects and prepares necessary calculations of cumulative earnings and profits, tax pools and amounts held in cash or other specified assets, as well as interprets the Tax Act and any additional guidance issued by the U.S. Treasury Department, the IRS, and other standard-setting bodies, the Company may make adjustments to the provisional amounts. Those adjustments may materially impact its provision for income taxes and effective tax rate in the period in which the adjustments are made. The Company expects to complete its accounting for the tax effects of the Tax Act in fiscal year 2019.  In connection with the Company’s initial analysis of the impact of the Tax Act, we recognized a provisional amount of $566,000 , which is included as a component of income tax expense.  Provisional Amounts  The Company remeasured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. However, the Company is still analyzing certain aspects of the Tax Act and refining its calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. The provisional amount recorded related to the remeasurement of the Company’s deferred tax balance resulted in an increase in income tax expense of $25,000 for the year ended April 30, 2018.  Prior to the enactment of Tax Act, the Company had not recorded U.S. income taxes on the undistributed earnings of the Company’s foreign subsidiaries. The earnings of the foreign subsidiaries have been indefinitely reinvested, and as a result, no deferred tax liability was previously recorded. In light of the Tax Act and the one-time transition tax, for the period ended January 31, 2018, the Company recorded a provisional amount for its one-time transition tax liability for the cumulative undistributed earnings of its foreign subsidiaries, resulting in an increase in income tax expense of $541,000 for the year ended April 30, 2018.  The one-time transition tax is based on total post-1986 earnings and profits (E&P) that the Company previously deferred from U.S. income taxes. The entire amount of the transition tax liability, except for $70,000 , is recorded as a long-term liability. The Company has not yet completed its calculation of the total post-1986 E&P for these foreign subsidiaries. Further, the transition tax is based in part on the amount of those earnings held in cash and other specified assets. This amount may change when the Company finalizes the calculation of post-1986 foreign E&P previously deferred from U.S. federal taxation and finalize the amounts held in cash or other specified assets.  As of April 30, 2018 the Company had a net operating loss carryforward for federal income tax purposes of approximately $1,068,000 which is carried forward indefinitely. The Company has state net operating loss carry-forwards totaling approximately $976,000 at April 30, 2018, that will begin to expire in fiscal year April 30, 2025 . The Company had foreign net operating loss carryforwards of $1,825,000 as of April 30, 2018 which will begin to expire in 2023 . The Company recognizes a valuation allowance if, based on the weight of available evidence, it is more likely than not that some portion, or all, of a deferred tax asset will not be realized. The Company determined it is more likely than not that it will realize the deferred tax assets due to the reversal of deferred tax liabilities and NOTE J - INCOME TAX - Continued  Deferred Tax Assets and Liabilities - Continued  forecast of future earnings. The deferred tax assets exceed the deferred tax liabilities and based on the reversing pattern in addition to the forecast of future earnings, the Company has concluded that all of the deferred tax liabilities are expected to reverse within the period of time available to fully utilize all the deferred tax assets. Therefore, the Company has concluded that a valuation allowance is not required as of April 30, 2018, related to net operating loss carryforwards. The Company has established a valuation allowance of $78,100 related to its foreign tax credit carry-forward. The Company’s estimate of cumulative taxable income during the foreign tax credit carryforward period is insufficient to support that the tax benefit from the foreign tax credit is more likely than not to be realized.  As a result of the Tax Act, the historic undistributed earnings of the Company’s foreign subsidiaries will be taxed in the U.S. via the one-time repatriation tax in fiscal 2018. As a result of this transition tax, the Company may repatriate its cash and cash equivalents held by its foreign subsidiaries without such funds being subject to further U.S. income tax liability. Certain unrepatriated foreign earnings remain subject to local country withholding taxes upon repatriation. The Company continues to apply its permanent reinvestment assertion on the cumulative amount of unremitted earnings of $13,085,000 as of April 30, 2018 from its foreign subsidiaries.  Unrecognized Tax Benefits  The Company has not identified any uncertain tax positions or expects any to be taken in the Company’s tax returns. For the fiscal year ended April 30, 2018 and 2017, the amount of consolidated worldwide liability for uncertain tax positions that impacted the Company’s effective tax rate was $0 for each year.  Other  Interest and penalties related to tax positions taken in the Company’s tax returns are recorded in income tax expense and miscellaneous selling, general and administrative expense, respectively, in the consolidated statements of operations. For the fiscal year ended April 30, 2018 and 2017, the amount included in the Company’s balance sheet for such liabilities was $0 for each year.  The Company is subject to taxation in the U.S. and various state and foreign jurisdictions. With few exceptions, the Company is no longer subject to state, local or foreign examinations by tax authorities for tax years before fiscal year 2015. The Internal Revenue Service previously concluded an audit of the Company’s fiscal year 2013 tax return, and a no change letter was issued.

401(k) Retirement Savings Plan

401(k) Retirement Savings Plan	12 Months Ended
	Apr. 30, 2018
401(k) Retirement Savings Plan [Abstract]
401(k) Retirement Savings Plan	NOTE K - 401(k) RETIREMENT SAVINGS PLAN  The Company sponsors 401(k) retirement savings plans, which are available to all non-union U.S. employees. The Company may elect to match participant contributions up to $300 per participant annually. The Company contributed $90,744 and $91,686 to the plans during the fiscal years ended April 30, 2018 and 2017 , respectively. The Company incurred total expenses of $12,700 and $8,000 for the fiscal years ended April 30, 2018 and 2017, respectively, relating to costs associated with the administration of the plans.  

Major Customers And Concentrati

Major Customers And Concentration Of Credit Risk	12 Months Ended
	Apr. 30, 2018
Major Customers And Concentration Of Credit Risk [Abstract]
Major Customers And Concentration Of Credit Risk	NOTE L - MAJOR CUSTOMERS AND CONCENTRATION OF CREDIT RISK  Financial instruments that potentially subject the Company to concentration of credit risk consist principally of uncollateralized accounts receivable. For the year ended April 30, 2018, two customers accounted for 20.2% and 13.3% of net sales of the Company, and 6.0% and 2.9% , respectively, of accounts receivable at April 30, 2018. For the year ended April 30, 2017, two customers accounted for 26.7% and 12.6% of net sales of the Company and 8.4% and 4.2% , respectively, of accounts receivable at April 30, 2017. Further, the Company has $1,325,149 in cash in China as of April 30, 2018. Effective May 1, 2015, China implemented a deposit insurance program to insure up to approximately $81,000 in deposits, under certain circumstances. Funds above this amount are not insured by a guaranteed deposit insurance system.   

Leases

Leases	12 Months Ended
	Apr. 30, 2018
Leases [Abstract]
Leases	NOTE M - LEASES  The Company leases certain facilities and office space under various operating leases expiring at various dates through April 2023. The Company also leases various machinery and equipment under capital leases.  Future minimum lease payments under leases with terms of one year or more are as follows:     Capital Operating  Years ending April 30, Leases Leases   2019 $ 2,685,337 $ 2,326,475  2020 2,041,239 1,860,538  2021 1,618,137 1,371,245  2022 874,589 707,338  2023 12,244 685,986   Total future minimum lease payments $ 7,231,546 $ 6,951,582   Less amounts representing interest 613,162   6,618,384   Less Current Portion 2,320,538   Long Term Portion $ 4,297,846 NOTE M - LEASES - Continued  Rent expense incurred under operating leases was $2,391,328 and $2,363,778 for the years ended April 30, 2018 and 2017, respectively.  In September 2010, the Company entered into a real estate lease agreement in Union City, CA, to rent approximately 117,000 square feet of manufacturing and office space. Under the terms of the lease agreement, the Company receives incentives over the life of the lease, which extends through March 2021 . The amount of the deferred rent income recorded for the fiscal year ended April 30, 2018 was $103,599 compared to $79,575 in fiscal year 2017. In addition, the landlord provided the Company tenant incentives of $418,000 , which are being amortized over the life of the lease. The balance of deferred rent at April 30, 2018 was $447,073 compared to $550,672 at April 30, 2017.  On May 31, 2012, the Company entered into a lease agreement in Tijuana, MX, to rent approximately 112,000 square feet of manufacturing and office space. Under the terms of the lease agreement, the Company receives incentives over the life of the lease, which extends through November 2018 . The amount of the deferred rent income for the fiscal year ended April 30, 2018 was $139,437 compared to $127,967 in fiscal year 2017. The balance of deferred rent at April 30, 2018 was $85,527 compared to $224,964 at April 30, 2017. 

Stock Compensation And Equity T

Stock Compensation And Equity Transactions	12 Months Ended
	Apr. 30, 2018
Stock Compensation And Equity Transactions [Abstract]
Stock Compensation And Equity Transactions	NOTE N - STOCK COMPENSATION AND EQUITY TRANSACTIONS  The Company has stock option plans (“Option Plans”) under which certain employees and non-employee directors may acquire shares of common stock. All Option Plans have been approved by the Company’s shareholders. At April 30, 2018, the Company has 117,914 shares available for future issuance to employees under the employee plans and none are available under the non-employee director plans. The Option Plans are interpreted and administered by the Compensation Committee of the Board of Directors. The maximum term of options granted under the Option Plans is generally 10 years. Options granted under the Option Plans are either incentive stock options or nonqualified options. Each option under the Option Plans is exercisable for one share of stock. Options forfeited under the Option Plans are available for reissuance. Options granted under these plans are granted at an exercise price equal to the fair market value of a share of the Company’s common stock on the date of grant.  The Company granted 25,000 options to employees in fiscal year 2014. The Company recognized approximately $0 and $3,500 in compensation expense in fiscal year 2018 and 2017, respectively. The balance of unrecognized compensation expense was $0 at April 30, 2018 and 2017.  The Company granted 285,000 options to employees in fiscal year 2016. The Company recognized approximately $83,700 and $325,700 in compensation expense in fiscal year 2018 and 2017, respectively. The balance of unrecognized compensation expense was approximately $0 and $83,700 at April 30, 2018 and 2017, respectively. In October 2017 and 2016, the Company issued 1 2 ,5 0 0 and 1 1 , 250 shares of restricted stock pursuant to the 2013 Non-Employee Director Restricted Stock Plan, which fully vested on April 1, 201 8 and 201 7 , respectively. The Company recognized $0 and $60,649 in compensation expense in fiscal year 2018 and 2017, respectively. The balance of unrecognized compensation expense related to the Company’s restricted stock award was $0 at April 30, 2018 and 2017.    NOTE N - STOCK COMPENSATION AND EQUITY TRANSACTIONS - Continued  The table below summarizes option activity through April 30, 2018:     Number of Number of  securities to be Weighted- options  issued upon average exercisable  exercise of exercise at end  outstanding options price of year  Outstanding at April 30, 2016 367,963 5.84 172,513  Options exercised during 2017 (1,200) 3.60  Outstanding at April 30, 2017 366,763 5.85 269,863  Options exercised during 2018 (19,445) 4.94  Outstanding at April 30, 2018 347,318 $ 5.90 347,318   Intrinsic value is calculated as the positive difference between the market price of the Company’s common stock and the exercise price of the underlying options. During the fiscal years ended April 30, 2018 and 2017, the aggregate intrinsic value of options exercised was $35,820 and $2,172, respectively. As of April 30, 2018 and 2017, the aggregate intrinsic value of in the money options outstanding was $305,396 and $135,151 , respectively.  Information with respect to stock options outstanding and exercisable at April 30, 2018 follows:    Options outstanding and exercisable   Number Weighted-average Weighted-  outstanding at remaining average  April 30, 2018 contract life exercise price  Range of exercise prices   $ 3.60-6.45 347,318 6.69 years $ 5.90   347,318 $ 5.90  As of April 30, 2018 there were no non-vested stock options.  The Company implemented an employee stock purchase plan (“ESPP”) for all eligible employees on February 1, 2014. The ESPP reserved 500,000 shares of common stock for issuance to employees. In addition, the number of shares of common stock reserved for issuance under the plan automatically increases on the first day of the Company’s fiscal years by 25,000 shares. The ESPP was terminated effective August 15, 2016. Final purchases under the ESPP were completed on August 31, 2016. There were 0 and 1,658 shares issued under the ESPP and the Company recorded $0 and $3,559 in compensation expense, for fiscal years ended April 30, 2018 and 2017, respectively.  

Selected Quarterly Financial Da

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Apr. 30, 2018
Selected Quarterly Financial Data (Unaudited) [Abstract]
Selected Quarterly Financial Data (Unaudited)	NOTE O - SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)  The following is a summary of unaudited quarterly financial data for fiscal year 2018:     First Second Third Fourth  2018 Quarter Quarter Quarter Quarter   Net sales $ 71,224,293 $ 72,959,074 $ 65,733,723 $ 68,214,619   Gross profit 6,757,054 7,103,568 5,897,340 6,844,956   Income (loss) before income 580,845 1,151,454 (115,872) (5,918,749)  taxes (1), (2)   Net income (loss) 382,882 736,115 31,338 (4,392,205)   Earnings (loss) per share $ 0.09 $ 0.17 $ 0.01 $ (1.04)  Basic   Earnings (loss) per share $ 0.09 $ 0.17 $ 0.01 $ (1.04)  Diluted   Weighted average shares- Basic 4,195,985 4,201,442 4,209,566 4,215,258   Weighted average shares- Diluted 4,269,501 4,326,854 4,356,509 4,215,258 1.) The Company records inventory reserves for valuation and shrinkage throughout the year based on historical data. In the fourth quarter of fiscal 2018 physical inventory results were completed resulting in an increase in income before income taxes of approximately $1,500,000 .  2.) The Company recognized a full goodwill impairment charge of $3,222,899, an impairment of intangible assets in the amount of $690,107 and the write off of the account receivable and note receivable related to Petzila in the amount of $2,509,423.  The aggregate after-tax effect for the above adjustments in the fourth quarter of fiscal 2018 was a decrease to basic earnings (loss) per share of $0.55 . NOTE O - SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) - Continued  The following is a summary of unaudited quarterly financial data for fiscal year 2017:    First Second Third Fourth  2017 Quarter Quarter Quarter Quarter   Net sales $ 59,184,975 $ 66,159,586 $ 62,164,167 $ 65,861,447   Gross profit (1) 5,770,234 5,818,669 5,686,959 7,899,446   Income before income 226,858 26,616 89,036 2,155,173  taxes (1), (2), (3)   Net income (loss) 146,597 33,295 (47,852) 1,258,166   Earnings (loss) per share $ 0.04 $ 0.01 $ (0.01) $ 0.30  Basic   Earnings (loss) per share $ 0.03 $ 0.01 $ (0.01) $ 0.30  Diluted   Weighted average shares- Basic 4,183,955 4,185,752 4,186,813 4,188,279   Weighted average shares- Diluted 4,214,535 4,225,874 4,186,813 4,207,266     1.) Due to a fire at one of the Company’s plants during 2017, the Company recorded expense of approximately $230,000 in prior quarters in costs of goods sold that was realized as an insurance recovery during the fourth quarter of 2017 as recovery was considered probable. As part of this settlement, a gain of approximately $277,000 was also recorded in the fourth quarter of fiscal 2017 due to the insurance claim exceeding the net book value of the replacement machinery and equipment destroyed.  2.) The Company records inventory reserves for valuation and shrinkage throughout the year based on historical data. In the fourth quarter of fiscal 2017 physical inventory results were completed and the Company adjusted the estimate which increased income before income taxes by approximately $780,000.  3.) As discussed in Note G, during the fourth quarter of fiscal 2017 the Company recorded a change in estimate related to Contingent Consideration which increased income before income tax expense in the amount of approximately $247,000.  The aggregate after-tax effect for the above adjustments in the fourth quarter of fiscal 2017 was an increase to basic earnings per share of $0.21 .  

Litigation

Litigation	12 Months Ended
	Apr. 30, 2018
Litigation [Abstract]
Litigation	NOTE P - LITIGATION  From time to time the Company is involved in legal proceedings, claims, or investigations that are incidental to the Company’s business. In future periods, the Company could be subjected to cash cost or non-cash charges to earnings if any of these matters are resolved on unfavorable terms. However, although the ultimate outcome of any legal matter cannot be predicted with certainty, based on present information, including management’s assessment of the merits of any particular claim, the Company does not expect these legal proceedings or claims will have any material adverse impact on its future consolidated financial position or results of operations.   

Summary Of Significant Accoun23

Summary Of Significant Accounting Policies (Policy)	12 Months Ended
	Apr. 30, 2018
Summary Of Significant Accounting Policies [Abstract]
Consolidation Policy	Consolidation Policy  The consolidated financial statements include the accounts and transactions of SigmaTron International, Inc. (“SigmaTron”), its wholly-owned subsidiaries, Standard Components de Mexico, S.A., AbleMex S.A. de C.V., Digital Appliance Controls de Mexico, S.A. de C.V., Spitfire Controls (Vietnam) Co. Ltd., Spitfire Controls (Cayman) Co. Ltd. and SigmaTron International Trading Co., wholly-owned foreign enterprises Suzhou SigmaTron Electronics Co. Ltd., and SigmaTron Electronic Technology Co., Ltd. (collectively, “SigmaTron China”), and its international procurement office, SigmaTron Taiwan. The functional currency of the Mexican, Vietnamese and Chinese subsidiaries and procurement branch is the U.S. Dollar. Intercompany transactions are eliminated in the consolidated financial statements. The impact of currency fluctuations for the fiscal year ended April 30, 2018 resulted in net foreign currency transaction gains of approximately $125,000 compared to net foreign currency losses of $508,000 in the prior year.
Use Of Estimates	Use of Estimates  The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates made in preparing the consolidated financial statements include depreciation and amortization periods, the allowance for doubtful accounts, reserves for inventory, lower of cost or market adjustment for inventory, contingent consideration, deferred taxes, uncertain tax positions, valuation allowance for deferred taxes and valuation of goodwill and long-lived assets. Actual results could materially differ from these estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents  Cash and cash equivalents include cash and all highly liquid short-term investments with original maturities within three months of the purchase date.
Accounts Receivable	Accounts Receivable  The majority of the Company’s accounts receivable are due from companies in the industrial electronics, consumer electronics and medical/life sciences industries. Credit is extended based on evaluation of a customer’s financial condition, and, generally, collateral is not required. Accounts receivable are due in accordance with agreed upon terms, and are stated at amounts due from customers net of an allowance for doubtful accounts. Accounts outstanding longer than the contractual payments terms are considered past due. The Company writes off accounts receivable when they are determined to be uncollectible.  The Company has arrangements with various financial institutions to sell certain eligible accounts receivable balances from specific customers. The accounts receivable balances sold are at the election of the Company and the Company incurred fees for such sales, which were not material for the year ended April 30, 2018 or 2017. The accounts receivable balances are derecognized at the time of sale, as the Company does not have continuing involvement after the point of sale. During the years ended April 30, 2018 and 2017, the Company sold without recourse trade receivables of approximately $78,000,000 and $95,000,000 , respectively. Cash proceeds from these agreements are reflected as operating activities included in the change in accounts receivable in the Company's consolidated statements of cash flows.
Allowance For Doubtful Accounts	Allowance for Doubtful Accounts  The Company’s allowance for doubtful accounts relates to receivables not expected to be collected from its customers. This allowance is based on management’s assessment of specific customer balances, considering the age of receivables and financial stability of the customer and a five year average of prior uncollectible amounts. If there is an adverse change in the financial condition of the Company’s customers, or if actual defaults are higher than provided for, an addition to the allowance may be necessary.
Inventories	Inventories  Inventories are valued at cost. Cost is determined by an average cost method and the Company allocates labor and overhead to work-in-process and finished goods. In the event of an inventory write-down, the Company records expense to state the inventory at lower of cost or net realizable value. The Company establishes inventory reserves for valuation, shrinkage, and excess and obsolete inventory. The Company records provisions for inventory shrinkage based on historical experience to account for unmeasured usage or loss. The Company records provisions for excess and obsolete inventories for the difference between the cost of inventory and its estimated realizable value based on assumptions about future product demand and market conditions. For convenience, the Company records these inventory reserves against the inventory cost through a contra asset rather than through a new cost basis. Upon a subsequent sale or disposal of the impaired inventory, the corresponding reserve is relieved to ensure the cost basis of the inventory reflects any reductions. Actual results differing from these estimates could significantly affect the Company’s inventories and cost of products sold as the inventory is sold or otherwise relieved.
Property, Machinery And Equipment	Property, Machinery and Equipment  Property, machinery and equipment are valued at cost. The Company provides for depreciation and amortization using the straight-line method over the estimated useful life of the assets:    Buildings 20 years  Machinery and equipment 5 -12 years  Office equipment and software 3 -5 years  Tools and dies 12 months  Leasehold improvements lesser of lease term or useful life  Expenses for repairs and maintenance are charged to selling and administrative expenses as incurred.
Deferred Financing Costs	Deferred Financing Costs  Deferred financing costs consist of costs incurred to obtain the Company’s long-term debt and are amortized using the effective interest method over the term of the related debt. Deferred financing fees of $319,332 and $208,583 net of accumulated amortization of $75,585 and $11,916 , respectively, as of April 30, 2018 and 2017, respectively, are deducted from long term debt on the Company’s balance sheet.
Income Taxes	Income Taxes  The Company’s income tax expense, deferred tax assets and liabilities and reserves for unrecognized tax benefits reflect management’s best assessment of estimated future taxes to be paid. The Company is subject to income taxes in both the U.S. and several foreign jurisdictions. Significant judgments and estimates by management are required in determining the consolidated income tax expense assessment.  Deferred income tax assets and liabilities are determined based on differences between financial reporting and tax basis of assets and liabilities, and are measured using the enacted tax rates and laws that are expected to be in effect when the differences are expected to reverse. In evaluating the Company’s ability to recover its deferred tax assets within the jurisdiction from which they arise, the Company considers all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax planning strategies and recent financial operations. In projecting future taxable income, the Company begins with historical results and changes in accounting policies, and incorporates assumptions including the amount of future state, federal and foreign pre-tax operating income, the reversal of temporary differences, and the implementation of feasible and prudent tax planning strategies. These assumptions require significant judgment and estimates by management about the forecasts of future taxable income and are consistent with the plans and estimates the Company uses to manage the underlying businesses. In evaluating the objective evidence that historical results provide, the Company considers three years of cumulative operating income and/or loss. Valuation allowances are established when necessary to reduce deferred income tax assets to an amount more likely than not to be realized.  The calculation of the Company’s tax liabilities involves dealing with uncertainties in the application of complex tax laws and regulations in a multitude of jurisdictions across its global operations. Changes in tax laws and rates could also affect recorded deferred tax assets and liabilities in the future. Except as noted below, management is not aware of any such changes that would have a material effect on the Company’s results of operations, cash flows or financial position.  A tax benefit from an uncertain tax position may only be recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on the technical merits. NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  Income Taxes - Continued  The Company adjusts its tax liabilities when its judgment changes as a result of the evaluation of new information not previously available. Due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from its current estimate of the tax liabilities. These differences will be reflected as increases or decreases to income tax expense in the period in which they are determined.
Earnings Per Share	Earnings per Share  Basic earnings per share are computed by dividing net income (loss) (the numerator) by the weighted-average number of common shares outstanding (the denominator) for the period. The computation of diluted earnings per share is similar to the computation of basic earnings per share, except that the denominator is increased to include the number of additional common shares that would have been outstanding if the potentially dilutive common stock equivalents such as stock options and restricted stock, had been exercised or vested. There were 109,402 and 285,000 anti-dilutive common stock equivalents at April 30, 2018 and April 30, 2017, respectively, which have been excluded from the calculation of diluted earnings per share.     Twelve Months Ended  April 30,  2018 2017   Net (loss) income $ (3,241,870) $ 1,390,206  Weighted-average shares  Basic 4,205,483 4,186,183  Effect of dilutive stock options - 27,409   Diluted 4,205,483 4,213,592   Basic (loss) earnings per share $ (0.77) $ 0.33   Diluted (loss) earnings per share $ (0.77) $ 0.33 
Revenue Recognition	 Revenue Recognition  Revenues from sales of the Company's electronic manufacturing services business are recognized when the finished good product is shipped to the customer. In general, and except for consignment inventory, it is the Company's policy to recognize revenue and related costs when the finished goods have been shipped from its facilities, which is also the same point in time that title passes under the terms of the purchase order and control passes to the customer. Finished goods inventory for certain customers is shipped from the Company to an independent warehouse for storage or shipped directly to the customer and stored in a segregated part of the customer’s own facility. Upon the customer’s request for finished goods inventory, the inventory is shipped to the customer if the inventory was stored off-site, or transferred from the segregated part of the customer’s facility for consumption or use by the customer. The Company recognizes revenue upon such shipment or transfer to the customer. The Company does not earn a fee for such arrangements. The Company from time to time may ship finished goods from its facilities, which is also the same point in time that title passes under the terms of the purchase order, and invoice the customer at the end of the calendar month. This is done only in special circumstances to accommodate a specific customer. Further, from time to time  NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  Revenue Recognition - Continued  customers request the Company hold finished goods after they have been invoiced to consolidate finished goods for shipping purposes. The Company generally provides a warranty for workmanship, unless the assembly was designed by the Company, in which case it warrants assembly/design. The Company does not have any installation, acceptance or sales incentives (although the Company has negotiated longer warranty terms in certain instances). The Company assembles and tests assemblies based on customers’ specifications. Historically, the amount of returns for workmanship issues has been de minimis under the Company’s standard or extended warranties.
Shipping And Handling Costs	Shipping and Handling Costs  The Company records shipping and handling costs for goods shipped to customers as selling and administrative expenses. Customers are typically invoiced for shipping costs and such amounts are included in net sales. Shipping and handling costs were not material to the financial statements for fiscal years 2018 or 2017.
Fair Value Measurements	Fair Value Measurements  Fair value measurements are determined based upon the exit price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants exclusive of any transaction costs. The Company utilizes a fair value hierarchy based upon the observability of inputs used in valuation techniques as follows:  Level 1: Observable inputs such as quoted prices in active markets; Level 2: Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3: Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
Fair Value Of Financial Instruments	Fair Value of Financial Instruments  The Company’s financial instruments include cash and cash equivalents, accounts receivable, note receivable, other receivables, accounts payable and accrued expenses which approximate fair value at April 30, 2018 and 2017, due to their short-term nature. The carrying amounts of the Company’s debt obligations approximate fair value based on future payments discounted at current interest rates for similar obligations or interest rates which fluctuate with the market.  The Company measured the contingent consideration included in the fiscal 2013 Spitfire acquisition under the fair value standard (primarily using level 3 measurement inputs). The contingent consideration continues to be measured and reported at fair value at each period end. The Company currently does not have any other non-financial assets and non-financial liabilities that are required to be measured at fair value on a recurring basis.  T he Company entered into an Asset Purchase Agreement with Wagz, Inc. (Wagz) whereby the Company sold assets to Wagz for $350,000 cash, 600,000 shares of Wagz Class C Common Stock and an earn-out based on sales by Wagz generated from use of the assets through July 31, 2022. The earn-out is $6.00 per unit of a product specified in the asset purchase agreement and any upgrade to such product. The fair value of the non-cash consideration consisted of $600,000 for the 600,000 shares of Wagz common stock which is recorded within other assets. The Company determined the fair value of the equity using the price per common share received by Wagz in a recent financing transaction, a level 3 input. The Company did not assign any value to the earn-out because any receipts from the earn-out are contingent upon Wagz selling the product specified in the asset purchase agreement between the Company and Wagz.
Goodwill	Goodwill  Goodwill represents the purchase price in excess of the fair value of assets acquired in business combinations. Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 350, “Intangibles – Goodwill and Other,” requires the Company to assess goodwill and other indefinite-lived intangible assets for impairment at least annually in the absence of an indicator of possible impairment and immediately upon an indicator of possible impairment. The Company is permitted the option to first assess qualitative factors to determine whether the existence of events and circumstances indicates that it is more likely than not that the fair value of any reporting unit is less than its corresponding carrying value. If, after assessing the totality of events and circumstances, the Company concludes that it is not more likely than not that the fair value of any reporting unit is less than its corresponding carrying value, then the Company is not required to take further action. However, if the Company concludes otherwise, then it is required to perform a quantitative impairment test, including computing the fair value of the reporting unit and comparing that value to its carrying value (the “step 2” requirement). If the fair value is less than its carrying value, a second step of the test is required to determine if recorded goodwill is impaired. The Company also has the option to bypass the qualitative assessment for goodwill in any period and proceed directly to performing the quantitative impairment test. The Company will be able to resume performing the qualitative assessment in any subsequent period. For fiscal 2017, the Company performed its annual goodwill impairment test as of February 1, 2017 and determined no impairment existed as of that date. The step one analysis was performed using a combination of a market approach and an income approach based on a discounted cash flow analysis.  For fiscal year 2018, the Company early adopted the guidance contained in Accounting Standards Update (ASU) No. 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment,” which removes the step 2 requirement to perform a hypothetical purchase price allocation to measure goodwill impairment. Beginning with its February 1, 2018 goodwill impairment testing, goodwill impairment is the amount by which the Company’s single reporting unit carrying value exceeds its fair value, not to exceed the recorded amount of goodwill. To estimate the fair value of the Company’s equity, the Company used both a market approach based on the guideline companies’ method, and an income approach based on a discounted cash flow analysis. The value indicated by both methods was weighted to arrive at a concluded value. The carrying value of the Company’s equity was greater than the fair value of the Company based on the valuation analysis by an amount greater than the recorded amount of the goodwill. In the fourth quarter of fiscal 2018, the Company’s forecasted future cash flow declined from prior estimates. The Company is experiencing declining margins due to pricing pressures from vendors and customers. Also at this time, electronic component manufacturers began allocating components to their customers which required the Company to increase its investment in working capital. The decline in the forecasted cash flow resulted in a lower estimate of the fair value of the Company’s reporting unit causing the Company to take an impairment charge on all of its goodwill. The Company has begun taking steps to improve its margins and has negotiated an increase in its revolving credit facility to address its working capital needs. Accordingly, the Company recognized a full goodwill impairment charge of $3,222,899.
Intangible Assets	Intangible Assets  Intangible assets are comprised of finite life intangible assets including patents, trade names, backlog, non-compete agreements, and customer relationships. Finite life intangible assets are amortized on a straight line basis over their estimated useful lives of 5 years for patents, 20 years for trade names, 1 year for backlog and 7 years for non-compete agreements except for customer relationships which are amortized on an accelerated basis over their estimated useful life of 15 years.
Impairment Of Long-Lived Assets	Impairment of Long-Lived Assets  The Company reviews long-lived assets, including amortizable intangible assets, for impairment. Property, machinery and equipment and finite life intangible assets are reviewed whenever events or changes in circumstances occur that indicate possible impairment. If events or changes in circumstances occur that indicate possible impairment, the NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  Impairment of Long-Lived Assets - Continued  Company first performs an impairment review based on an undiscounted cash flow analysis at the lowest level at which cash flows of the long-lived assets are largely independent of other groups of its assets and liabilities. This analysis requires management judgment with respect to changes in technology, the continued success of product lines, and future volume, revenue and expense growth rates. If the carrying value exceeds the undiscounted cash flows, the Company records an impairment, if any, for the difference between the estimated fair value of the asset group and its carrying value. The Company further conducts annual reviews for idle and underutilized equipment, and reviews business plans for possible impairment. As a result of the analysis performed in the fourth quarter of fiscal 2018, the Company determined that the carrying value of the trade name intangible asset was not recoverable and recorded a charge of $690,107 for the entire carrying amount. The Company’s analysis did not indicate that any of its other long-lived assets were impaired. 
Settlement Of Receivable, Related Sale Of Assets And Investments	Settlement of Receivable, Related Sale of Assets and Investments  As more fully described in Note E – Related Parties, the Company has recorded an investment in Wagz, a privately held company whose equity does not have a readily determinable fair value. As permitted by ASC 321, Investments - Equity Securities, paragraph 321-35-2, the Company has elected to carry its investment in Wagz equity at its cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or a similar investment of the same issuer until the investment no longer qualifies to be measured under paragraph 321-35-2. The balance at fiscal year ended April 30, 2018 was $600,000 which is recorded under other assets. For the fiscal year ended April 30, 2018, the Company has not recognized any impairment of this investment.
Stock Incentive Plans	Stock Incentive Plans  Under the Company’s stock option plans, options to acquire shares of common stock have been made available for grant to certain employees and directors. Each option granted has an exercise price of not less than 100% of the market value of the common stock on the date of grant. The contractual life of each option is generally 10 years. The vesting of the grants varies according to the individual options granted. The Company measures the cost of employee services received in exchange for an equity award based on the grant date fair value and records that cost over the respective vesting period of the award.
Reclassifications	Reclassifications  Certain reclassifications have been made to the previously reported 2017 financial statements to conform to the 2018 presentation. There was no change to net income.
New Accounting Standards	New Accounting Standards  In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, "Revenue from Contracts with Customers" (Topic 606) which supersedes the revenue recognition requirements in ASC 605, “ Revenue Recognition” . In summary, the core principle of this standard, along with various subsequent amendments, is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additionally, the new standard requires enhanced disclosures about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts, including revenue recognition policies to identify performance obligations, assets recognized from costs incurred to obtain and fulfill a contract, and significant judgments in measurements and recognition. The standard, as amended, was effective for annual periods beginning after December 15, 2017, including interim periods within that reporting period. Companies have the option of using either a full or modified retrospective approach in applying this standard.  NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  New Accounting Standards – Continued  To plan for the adoption of the standard, the Company conducted an analysis to determine the impact the new standard would have on its consolidated financial statements. This analysis included reviewing 1) contract terms and existing accounting policies to determine the financial impact of the standard, 2) data availability and system reports to meet the additional disclosure requirements of the standard, 3) any practical expedients the Company could elect upon adoption and 4) the control environment and internal processes to ensure the appropriate controls are in place. As part of implementation efforts we reviewed and modified our standard manufacturing agreement and invoice terms and conditions to emphasize that title, risk of loss and control of the finished goods products we sell transfers to our customers upon shipment.  The Company adopted the ASU on May 1, 2018 using the modified retrospective transition method, applying the guidance to those contracts which were not completed as of that date. The Company’s adoption of ASC 606 did not result in any changes in accounting requiring a transition adjustment to retained earnings.  Pursuant to the Company’s adoption of the standard, it is in the process of expanding its disclosures in the consolidated financial statements for revenue recognition, assets and liabilities relating to contracts with customers, the nature of the Company’s performance obligations and the manner by which the Company determines and allocates transaction prices to its performance obligations, and the significant judgments inherent in its revenue recognition policies. The Company also is in the process of implementing enhancements to its internal controls to support the Company’s ability to sustain compliance with the standard after adoption.  In February 2016, the FASB issued ASU No. 2016-02, “ Leases” . The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for capital leases and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. While the Company is still evaluating the impact of its pending adoption of the new standard on its consolidated financial statements, the Company expects that upon adoption in the fiscal year ending April 30, 2020, it will recognize ROU assets and lease liabilities and the amounts could be material.  In March 2016, the FASB issued ASU No. 2016-09, “ Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting”, a new accounting standard update intended to simplify several aspects of the accounting for share-based payment transactions including: income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. Specifically, the update requires that excess tax benefits and tax deficiencies (the difference between the deduction for tax purposes and the compensation cost recognized for financial reporting purposes) be recognized as income tax expense or benefit in the consolidated statements of operations, introducing a new element of volatility to the provision for income taxes. This update is effective for fiscal years beginning after December 15, 2016. Early adoption is permitted. The Company adopted the ASU on May 1, 2017. Effective with the adoption of the ASU all share-based awards continue to be accounted for as equity awards, excess tax benefits recognized on stock-based compensation expense are reflected in the consolidated statements of operations as a component of the provision for income taxes on a prospective basis, excess tax benefits recognized on stock-based compensation expense are classified as an operating activity in the consolidated statements of cash flows on a prospective basis and the Company has elected to continue to estimate expected forfeitures over the course of a vesting period. The adoption of the ASU had no material impact on the retained earnings, other components of equity or net assets as of the beginning of the period of adoption. NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  New Accounting Standards - Continued  In June 2016, the FASB issued ASU No. 2016-13, “ Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments .” ASU 2016-13 introduces a new forward-looking approach, based on expected losses, to estimate credit losses on certain types of financial instruments, including trade receivables. The estimate of expected credit losses will require entities to incorporate considerations of historical information, current information and reasonable and supportable forecasts. This ASU also expands the disclosure requirements to enable users of financial statements to understand the entity’s assumptions, models and methods for estimating expected credit losses. For public business entities, ASU 2016-13 is effective for annual and interim reporting periods beginning after December 15, 2019, and the guidance is to be applied using the modified-retrospective approach. Earlier adoption is permitted for annual and interim reporting periods beginning after December 15, 2018. The Company is currently evaluating the new guidance and has not determined the impact this ASU may have on its consolidated financial statements.  In August 2016, the FASB issued ASU Update No. 2016-15, “Statement of Cash Flows- Classification of Certain Cash Receipts and Cash Payments, ” which is intended to reduce diversity in practice in how certain transactions are classified in the statements of cash flows. This update will be effective for fiscal years beginning after December 15, 2017 (the Company’s fiscal year ending April 30, 2019), and interim periods within those fiscal years. Early adoption is permitted, provided that all of the amendments are adopted in the same period. The guidance requires application using a retrospective transition method. The Company plans to adopt the ASU in its fiscal year ending April 30, 2019. The Company does not expect the impact of the adoption of this ASU to have a material impact on the Company’s consolidated statements of cash flows.  In January 2017, the FASB issued ASU No. 2017-04, “ Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment ,” which removes the step 2 requirement to perform a hypothetical purchase price allocation to measure goodwill impairment. Goodwill impairment will now be the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the recorded amount of goodwill. This guidance is effective for public companies for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019, and early adoption is permitted. The Company early adopted this guidance in the third quarter of its fiscal year ending April 30, 2018 and is applying this guidance to all future tests.  In January 2017, the FASB issued ASU No. 2017-01, “ Business Combinations (Topic 805): Clarifying the Definition of a Business ,” which clarifies the definition of a business when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. For public companies, this ASU is effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The Company adopted this ASU in the fourth quarter of its fiscal year ending April 30, 2018. The Company will apply the clarified definition of a business, as applicable, from the period of adoption.  In February 2018, the FASB issued ASU No. 2018-02, “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” The guidance permits entities to reclassify tax effects stranded in Accumulated Other Comprehensive Income as a result of tax reform to retained earnings. This new guidance is effective for annual and interim periods in fiscal years beginning after December 15, 2018. Early adoption is permitted in annual and interim periods and can be applied retrospectively or in the period of adoption. The Company plans to adopt this ASU in the first quarter of its fiscal year ending April 30, 2019 and is currently evaluating the impact that its adoption may have on its consolidated financial statements. NOTE B - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Continued  New Accounting Standards - Continued  In May 2018, the FASB issued ASU No. 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 , regarding the accounting implications of the recently issued Tax Cuts and Jobs Act (the “Act”). This standard is effective immediately. The update clarifies that in a company’s financial statements that include the reporting period in which the Act was enacted, the company must first reflect the income tax effects of the Act in which the accounting under GAAP is complete. These amounts would not be provisional amounts. The company would also report provisional amounts for those specific income tax effects for which the accounting under GAAP is incomplete but a reasonable estimate can be determined. The Company has recorded a provisional amount which it believes is a reasonable estimate of the effects of the Act on the Company’s financial statements as of April 30, 2018. Technical corrections or other forthcoming guidance could change how the Company interprets provisions of the Act, which may impact its effective tax rate and could affect its deferred tax assets, tax positions and/or its tax liabilities. 

Summary Of Significant Accoun24

Summary Of Significant Accounting Policies (Tables)	12 Months Ended
	Apr. 30, 2018
Summary Of Significant Accounting Policies [Abstract]
Depreciation and Amortization Using Straight-Line Method Over Estimated Useful Life	  Buildings 20 years  Machinery and equipment 5 -12 years  Office equipment and software 3 -5 years  Tools and dies 12 months  Leasehold improvements lesser of lease term or useful life 
Computation Of Basic And Diluted Earnings Per Share	  Twelve Months Ended  April 30,  2018 2017   Net (loss) income $ (3,241,870) $ 1,390,206  Weighted-average shares  Basic 4,205,483 4,186,183  Effect of dilutive stock options - 27,409   Diluted 4,205,483 4,213,592   Basic (loss) earnings per share $ (0.77) $ 0.33   Diluted (loss) earnings per share $ (0.77) $ 0.33 

Allowance for Doubtful Accoun25

Allowance for Doubtful Accounts (Tables)	12 Months Ended
	Apr. 30, 2018
Allowance For Doubtful Accounts [Abstract]
Changes in Company's Allowance for Doubtful Accounts	  2018 2017  Beginning Balance $ 100,000 $ 100,000  Bad debt expense 200,000 -  Write-offs - -  $ 300,000 $ 100,000  

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Apr. 30, 2018
Inventories [Abstract]
Components Of Inventory	  2018 2017   Finished products $ 20,404,849 $ 20,291,768  Work-in-process 2,075,465 1,795,852  Raw materials 65,652,411 52,748,542  88,132,725 74,836,162  Less obsolescence reserve 1,202,932 1,264,924  $ 86,929,793 $ 73,571,238 
Changes In Inventory Obsolescence Reserve	  2018 2017   Beginning balance $ 1,264,924 $ 1,212,532  Provision for obsolescence - 300,000  Write-offs (61,992) (247,608)  $ 1,202,932 $ 1,264,924 

Property, Machinery And Equip27

Property, Machinery And Equipment, Net (Tables)	12 Months Ended
	Apr. 30, 2018
Property, Machinery And Equipment, Net [Abstract]
Schedule Of Property, Machinery And Equipment	  2018 2017   Land and buildings $ 17,072,098 $ 16,969,769  Machinery and equipment 61,746,650 59,795,532  Office equipment and software 10,670,918 9,601,149  Leasehold improvements 2,673,100 2,622,870  Equipment under capital leases 12,417,034 8,752,613   104,579,800 97,741,933   Less accumulated depreciation  and amortization, including  amortization of assets under  capital leases of $3,072,310  and $2,093,544 at April 30,  2018 and 2017, respectively 69,290,803 64,733,219   Property, machinery and  equipment, net  $ 35,288,997 $ 33,008,714 

Goodwill And Intangible Assets

Goodwill And Intangible Assets (Tables)	12 Months Ended
	Apr. 30, 2018
Goodwill And Intangible Assets [Abstract]
Change In Carrying Amount Of Goodwill	  2018 2017  Beginning balance $ 3,222,899 $ 3,222,899  Impairment (3,222,899) -  Ending balance $ - $ 3,222,899 
Summary Of Intangible Assets Subject To Amortization	Intangible assets subject to amortization are summarized as of April 30, 2018 as follows:    Weighted Average  Remaining Gross  Amortization Carrying Accumulated  Period (Years) Amount Amortization  Other intangible assets – Able - $ 375,000 $ 375,000 Customer relationships – Able - 2,395,000 2,395,000 Spitfire: Non-contractual customer relationships 9.08 4,690,000 1,609,670 Backlog - 22,000 22,000 Trade names 14.08 - - Non-compete agreements 1.08 50,000 42,245 Patents - 400,000 400,000 Total $ 7,932,000 $ 4,843,915   Intangible assets subject to amortization are summarized as of April 30, 2017 as follows:    Weighted Average  Remaining Gross  Amortization Carrying Accumulated  Period (Years) Amount Amortization  Other intangible assets – Able - $ 375,000 $ 375,000 Customer relationships – Able - 2,395,000 2,395,000 Spitfire: Non-contractual customer relationships 10.08 4,690,000 1,237,410 Backlog - 22,000 22,000 Trade names 15.08 980,000 240,897 Non-compete agreements 2.08 50,000 35,105 Patents 0.08 400,000 393,353 Total $ 8,912,000 $ 4,698,765 
Estimated Aggregate Amortization Expense	  For the fiscal year ending April 30:  2019 $ 374,725  2020 362,410  2021 354,203  2022 346,582  2023 339,128  Thereafter 1,311,037  $ 3,088,085 

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Apr. 30, 2018
Long-Term Debt [Abstract]
Aggregate Amount of Debt, Net Deferred Financing Fees	 Fiscal Year Total   2019 $ 655,190  2020 655,190  2021 655,190  2022 35,473,499  $ 37,439,069  

Accrued Expenses and Wages (Tab

Accrued Expenses and Wages (Tables)	12 Months Ended
	Apr. 30, 2018
Accrued Expenses And Wages [Abstract]
Schedule Of Accrued Expenses	  2018 2017   Interest $ 121,845 $ 90,639  Commissions 187,936 143,738  Professional fees 322,377 419,801  Other - Purchases 156,634 117,069  Other 2,142,000 1,550,808   $ 2,930,792 $ 2,322,055 
Schedule Of Accrued Wages	  2018 2017   Wages $ 1,945,142 $ 1,785,078  Bonuses 467,306 819,207  Foreign wages 1,318,307 1,885,317   $ 3,730,755 $ 4,489,602 

Income Tax (Tables)

Income Tax (Tables)	12 Months Ended
	Apr. 30, 2018
Income Tax [Abstract]
(Loss) Income before Income Tax (Benefit) Expense	  2018 2017   Domestic $ (5,906,596) $ 1,326,266  Foreign 1,604,274 1,171,417   $ (4,302,322) $ 2,497,683 
Income Tax Provision	  2018 2017   Current  Federal $ 433,291 $ 501,226  State 28,296 13,697  Foreign 712,846 589,913  Total Current 1,174,433 1,104,836   Deferred  Federal (1,551,921) (54,213)  State (240,647) 59,884  Foreign (442,317) (3,030)  Total Deferred (2,234,885) 2,641   Income tax $ (1,060,452) $ 1,107,477  
Reconciliation of Income Taxes	  2018 2017   U.S Federal Provision:  At statutory rate $ (1,325,872) $ 849,215  State taxes (151,508) 42,643  Change in valuation allowance - 78,100  Foreign tax differential 60,302 (89,885)  Impact of state tax rate change 3,670 5,920  Impact of foreign permanent items 23,106 7,171  Tax law changes 581,222 28,599  Foreign currency exchange gain/loss (172,062) 328,239  Foreign inflation adjustment (129,227) (61,707)  Stock based compensation 49,917 (80,818)   Provision for income taxes $ (1,060,452) $ 1,107,477 
Deferred Tax Assets and Liabilities	  2018 2017   Deferred Tax Assets  Federal, foreign & state NOL carryforwards $ 730,561 $ 29,168  Foreign tax credit 78,100 78,100  Reserves and accruals 598,364 723,313  Stock based compensation 314,221 462,156  Inventory 869,471 1,177,067  Other intangibles 834,512 206,736  Deferred rent 114,171 211,509  Allowance for doubtful accounts 76,500 38,360  Other DTA - 13,839  Federal benefit of state - 45,589  Total Gross Deferred Tax Assets 3,615,900 2,985,837  Less: Valuation allowance (78,100) (78,100)   Net Deferred Tax Assets $ 3,537,800 $ 2,907,737   Deferred Tax Liabilities  Other assets $ (3,485) $ (318,830)  Property, machinery & equipment (2,198,332) (3,441,393)  Prepaids (203,924) (272,718)  Federal benefit of state (22,378) -  Total Deferred Tax Liabilities $ (2,428,119) $ (4,032,941)   Net Deferred Tax Asset (Liability) $ 1,109,681 $ (1,125,204) 

Leases (Tables)

Leases (Tables)	12 Months Ended
	Apr. 30, 2018
Leases [Abstract]
Future Minimum Lease Payments Under Leases	  Capital Operating  Years ending April 30, Leases Leases   2019 $ 2,685,337 $ 2,326,475  2020 2,041,239 1,860,538  2021 1,618,137 1,371,245  2022 874,589 707,338  2023 12,244 685,986   Total future minimum lease payments $ 7,231,546 $ 6,951,582   Less amounts representing interest 613,162   6,618,384   Less Current Portion 2,320,538   Long Term Portion $ 4,297,846 

Stock Compensation And Equity33

Stock Compensation And Equity Transactions (Tables)	12 Months Ended
	Apr. 30, 2018
Stock Compensation And Equity Transactions [Abstract]
Summarized Option Activity	  Number of Number of  securities to be Weighted- options  issued upon average exercisable  exercise of exercise at end  outstanding options price of year  Outstanding at April 30, 2016 367,963 5.84 172,513  Options exercised during 2017 (1,200) 3.60  Outstanding at April 30, 2017 366,763 5.85 269,863  Options exercised during 2018 (19,445) 4.94  Outstanding at April 30, 2018 347,318 $ 5.90 347,318 
Stock Options Outstanding, Exercisable, and Non-vested	   Options outstanding and exercisable   Number Weighted-average Weighted-  outstanding at remaining average  April 30, 2018 contract life exercise price  Range of exercise prices   $ 3.60-6.45 347,318 6.69 years $ 5.90   347,318 $ 5.90 

Selected Quarterly Financial 34

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Apr. 30, 2018
Selected Quarterly Financial Data (Unaudited) [Abstract]
Summary Of Quarterly Financial Data	   First Second Third Fourth 2018 Quarter Quarter Quarter Quarter  Net sales $ 71,224,293 $ 72,959,074 $ 65,733,723 $ 68,214,619  Gross profit 6,757,054 7,103,568 5,897,340 6,844,956  Income (loss) before income 580,845 1,151,454 (115,872) (5,918,749) taxes (1), (2)  Net income (loss) 382,882 736,115 31,338 (4,392,205)  Earnings (loss) per share $ 0.09 $ 0.17 $ 0.01 $ (1.04) Basic  Earnings (loss) per share $ 0.09 $ 0.17 $ 0.01 $ (1.04) Diluted  Weighted average shares- Basic 4,195,985 4,201,442 4,209,566 4,215,258  Weighted average shares- Diluted 4,269,501 4,326,854 4,356,509 4,215,258   1.) The Company records inventory reserves for valuation and shrinkage throughout the year based on historical data. In the fourth quarter of fiscal 2018 physical inventory results were completed resulting in an increase in income before income taxes of approximately $1,500,000.  2.) The Company recognized a full goodwill impairment charge of $3,222,899, an impairment of intangible assets in the amount of $690,107 and the write off of the account receivable and note receivable related to Petzila in the amount of $2,509,423.    First Second Third Fourth 2017 Quarter Quarter Quarter Quarter  Net sales $ 59,184,975 $ 66,159,586 $ 62,164,167 $ 65,861,447  Gross profit (1) 5,770,234 5,818,669 5,686,959 7,899,446  Income before income 226,858 26,616 89,036 2,155,173 taxes (1), (2), (3)  Net income (loss) 146,597 33,295 (47,852) 1,258,166  Earnings (loss) per share $ 0.04 $ 0.01 $ (0.01) $ 0.30 Basic  Earnings (loss) per share $ 0.03 $ 0.01 $ (0.01) $ 0.30 Diluted  Weighted average shares- Basic 4,183,955 4,185,752 4,186,813 4,188,279  Weighted average shares- Diluted 4,214,535 4,225,874 4,186,813 4,207,266     1.) Due to a fire at one of the Company’s plants during 2017, the Company recorded expense of approximately $230,000 in prior quarters in costs of goods sold that was realized as an insurance recovery during the fourth quarter of 2017 as recovery was considered probable. As part of this settlement, a gain of approximately $277,000 was also recorded in the fourth quarter of fiscal 2017 due to the insurance claim exceeding the net book value of the replacement machinery and equipment destroyed.  2.) The Company records inventory reserves for valuation and shrinkage throughout the year based on historical data. In the fourth quarter of fiscal 2017 physical inventory results were completed and the Company adjusted the estimate which increased income before income taxes by approximately $780,000.  3.) As discussed in Note G, during the fourth quarter of fiscal 2017 the Company recorded a change in estimate related to Contingent Consideration which increased income before income tax expense in the amount of approximately $247,000.

Description Of The Business (Na

Description Of The Business (Narrative) (Details) - segment	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Description Of Business [Abstract]
Number of business segments as an independent provider of electronic manufacturing services	1
Total consolidated assets of the Company located in foreign jurisdictions outside the United States	14.00%	14.00%

Summary Of Significant Accoun36

Summary Of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Apr. 30, 2018USD ($)$ / itemshares	Apr. 30, 2017USD ($)shares
Summary Of Significant Accounting Policies [Line Items]
Impact of currency fluctuation, resulted net foreign currency gains (losses)	$ 125,000	$ (508,000)
Proceeds from sale of trade receivables	$ 78,000,000	95,000,000
Accounts receivable average uncollectible period	5 years
Deferred financing fees	$ 319,332	208,583
Deferred finance cost accumulated amortization	$ 75,585	$ 11,916
Anti-dilutive common stock outstanding excluded from the calculation of diluted earnings per share | shares	109,402	285,000
Impairment	$ 3,222,899
Contractual life of options	10 years
Cash from sold assets to Wagz	$ 350,000
Fair value of non-cash consideration	$ 600,000
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Option exercise price as a percentage of market price of shares	100.00%
Patents [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	5 years
Trade Names [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	20 years
Backlog [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	1 year
Non-Compete Agreements [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	7 years
Customer Relationships [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	15 years
Wagz [Member]
Summary Of Significant Accounting Policies [Line Items]
Asset Purchase Agreement end date	Jul. 31, 2022
Asset Purchase Agreement earn-out | $ / item	6
Wagz [Member] | Common Class C [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares acquired from Asset Purchase Agreement | shares	600,000

Summary Of Significant Accoun37

Summary Of Significant Accounting Policies (Depreciation and Amortization Using Straight-Line Method Over Estimated Useful Life) (Details)	12 Months Ended
	Apr. 30, 2018
Buildings [Member]
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Machinery And Equipment [Member] | Minimum [Member]
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Machinery And Equipment [Member] | Maximum [Member]
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	12 years
Office Equipment And Software [Member] | Minimum [Member]
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Office Equipment And Software [Member] | Maximum [Member]
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Tools And Dies [Member]
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	12 months
Leasehold Improvements [Member]
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Term of lease	lesser of lease term or useful life

Summary Of Significant Accoun38

Summary Of Significant Accounting Policies (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2018	Apr. 30, 2017
Earnings Per Share And Stockholders' Equity [Abstract]
Net (loss) income	$ (4,392,205)	$ 31,338	$ 736,115	$ 382,882	$ 1,258,166	$ (47,852)	$ 33,295	$ 146,597	$ (3,241,870)	$ 1,390,206
Weighted-average shares, Basic	4,215,258	4,209,566	4,201,442	4,195,985	4,188,279	4,186,813	4,185,752	4,183,955	4,205,483	4,186,183
Weighted-average shares, Effect of dilutive stock options										27,409
Weighted-average shares, Diluted	4,215,258	4,356,509	4,326,854	4,269,501	4,207,266	4,186,813	4,225,874	4,214,535	4,205,483	4,213,592
Basic (loss) earnings per share	$ (1.04)	$ 0.01	$ 0.17	$ 0.09	$ 0.30	$ (0.01)	$ 0.01	$ 0.04	$ (0.77)	$ 0.33
Diluted (loss) earnings per share	$ (1.04)	$ 0.01	$ 0.17	$ 0.09	$ 0.30	$ (0.01)	$ 0.01	$ 0.03	$ (0.77)	$ 0.33

Allowance For Doubtful Accoun39

Allowance For Doubtful Accounts (Changes in Company's Allowance for Doubtful Accounts) (Details) - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Allowance For Doubtful Accounts [Abstract]
Beginning Balance	$ 100,000	$ 100,000
Bad debt expense	200,000
Write-offs
Ending Balance	$ 300,000	$ 100,000

Inventories (Components Of Inve

Inventories (Components Of Inventory) (Details) - USD ($)	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Inventories [Abstract]
Finished products	$ 20,404,849	$ 20,291,768
Work-in-process	2,075,465	1,795,852
Raw materials	65,652,411	52,748,542
Total inventory, gross	88,132,725	74,836,162
Less obsolescence reserve	1,202,932	1,264,924	$ 1,212,532
Total inventory, net	$ 86,929,793	$ 73,571,238

Inventories (Changes in Invento

Inventories (Changes in Inventory Obsolescence Reserve) (Details) - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Inventories [Abstract]
Beginning balance	$ 1,264,924	$ 1,212,532
Provision for obsolescence		300,000
Write-offs	(61,992)	(247,608)
Ending balance	$ 1,202,932	$ 1,264,924

Related Parties (Narrative) (De

Related Parties (Narrative) (Details)	Apr. 30, 2018USD ($)	Jul. 31, 2017USD ($)	Dec. 06, 2016	Jan. 29, 2016USD ($)$ / shares	Apr. 30, 2018USD ($)	Feb. 28, 2018USD ($)	Apr. 30, 2018USD ($)$ / itemshares	Apr. 30, 2017USD ($)	Mar. 31, 2015employee
Related Party Transaction [Line Items]
Amount owed by Petzila	$ 3,652,800				$ 3,652,800		$ 3,652,800
Outstanding note receivable from related parties	2,117,500				2,117,500		2,117,500	$ 888,000
Outstanding account receivable from related parties	1,535,300				1,535,300		1,535,300	1,271,000
Inventory on hand from related parties	211,000				211,000		211,000	$ 310,000
Note receivable from related parties		$ 887,531
Warrants from related parties		0
Embedded derivative from related parties		0
Gain or loss on the extinguishment		$ 0
Fund to related parties					145,000
Cash from sold assets to Wagz							350,000
Loss on settlement of receivable and disposal of related assets							2,509,423
Fair value of non-cash consideration	600,000				$ 600,000		$ 600,000
Extended Forbearance And Maturity [Member] | Monthly [Member]
Related Party Transaction [Line Items]
Fund to related parties						$ 105,000
Promissory Note [Member]
Related Party Transaction [Line Items]
Conversion of accounts receivable into a notes receivable				$ 888,000
Interest rate				8.00%
Maturity date				Oct. 31, 2016
Maturity within number of days after obtains equity financing by related parties				10 days
Warrants period				10 years
Warrants exercise price, per share | $ / shares				$ 0.01
Promissory Note [Member] | Extended Maturity [Member]
Related Party Transaction [Line Items]
Maturity date			Jul. 31, 2017
Promissory Note [Member] | Extended Interest Rate [Member]
Related Party Transaction [Line Items]
Interest rate			8.00%
Promissory Note [Member] | Forbearance Agreement [Member]
Related Party Transaction [Line Items]
Interest rate		8.00%
Related parties business be sold at a price exceeding		$ 5,000,000
Fund to related parties		$ 315,000
Executive [Member]
Related Party Transaction [Line Items]
Number of executive officers invested in a start-up customer | employee									2
Minimum [Member]
Related Party Transaction [Line Items]
Percentage of warrants exercised on equity securities with related parties				1.00%
Maximum [Member] | Executive [Member]
Related Party Transaction [Line Items]
Executive officers' investment holding, percentage									2.00%
Petzila [Member]
Related Party Transaction [Line Items]
Contingent consideration	$ 3,500,000
Wagz [Member]
Related Party Transaction [Line Items]
Asset Purchase Agreement end date							Jul. 31, 2022
Asset Purchase Agreement earn-out | $ / item							6
Fair value of assets received							$ 950,000
Common Class C [Member] | Wagz [Member]
Related Party Transaction [Line Items]
Shares acquired from Asset Purchase Agreement | shares							600,000

Property, Machinery and Equip43

Property, Machinery and Equipment, Net (Narrative) (Details) - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Property, Machinery And Equipment, Net [Abstract]
Depreciation and amortization expense	$ 5,118,297	$ 4,708,876

Property, Machinery and Equip44

Property, Machinery and Equipment, Net (Schedule Of Property, Machinery And Equipment) (Details) - USD ($)	Apr. 30, 2018	Apr. 30, 2017
Property, Machinery and Equipment [Line Items]
Property, machinery and equipment, gross	$ 104,579,800	$ 97,741,933
Less accumulated depreciation and amortization, including amortization of assets under capital leases of $3,072,310 and $2,093,544 at April 30, 2018 and 2017, respectively	69,290,803	64,733,219
Property, machinery and equipment, net	35,288,997	33,008,714
Amortization of assets under capital leases	3,072,310	2,093,544
Land And Buildings [Member]
Property, Machinery and Equipment [Line Items]
Property, machinery and equipment, gross	17,072,098	16,969,769
Machinery And Equipment [Member]
Property, Machinery and Equipment [Line Items]
Property, machinery and equipment, gross	61,746,650	59,795,532
Office Equipment And Software [Member]
Property, Machinery and Equipment [Line Items]
Property, machinery and equipment, gross	10,670,918	9,601,149
Leasehold Improvements [Member]
Property, Machinery and Equipment [Line Items]
Property, machinery and equipment, gross	2,673,100	2,622,870
Equipment Under Capital Leases [Member]
Property, Machinery and Equipment [Line Items]
Property, machinery and equipment, gross	$ 12,417,034	$ 8,752,613

Goodwill And Intangible Asset45

Goodwill And Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	May 31, 2012
Goodwill [Line Items]
Impairment of goodwill	$ 3,222,899
Impairment of intangible asset	690,107
Amortization expense	435,043	490,010
Adjustment on contingent consideration liability	(84,344)	(353,591)
Spitfire [Member]
Goodwill [Line Items]
Estimated fair value of contingent consideration			$ 2,320,000
Total payment for business acquisition	226,014	273,672
Adjustment on contingent consideration liability	(353,591)	(84,344)
Contingent consideration liability	$ 213,460	$ 523,818

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets (Change In Carrying Amount Of Goodwill) (Details) - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Goodwill And Intangible Assets [Abstract]
Beginning balance	$ 3,222,899	$ 3,222,899
Impairment	(3,222,899)
Ending balance		$ 3,222,899

Goodwill And Intangible Asset47

Goodwill And Intangible Assets (Summary Of Intangible Assets Subject To Amortization) (Details) - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,932,000	$ 8,912,000
Accumulated Amortization	4,843,915	4,698,765
Able [Member] | Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	375,000	375,000
Accumulated Amortization	375,000	375,000
Able [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,395,000	2,395,000
Accumulated Amortization	$ 2,395,000	$ 2,395,000
Spitfire [Member] | Non-Contractual Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	9 years 29 days	10 years 29 days
Gross Carrying Amount	$ 4,690,000	$ 4,690,000
Accumulated Amortization	1,609,670	1,237,410
Spitfire [Member] | Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,000	22,000
Accumulated Amortization	$ 22,000	$ 22,000
Spitfire [Member] | Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	14 years 29 days	15 years 29 days
Gross Carrying Amount		$ 980,000
Accumulated Amortization		$ 240,897
Spitfire [Member] | Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	1 year 29 days	2 years 29 days
Gross Carrying Amount	$ 50,000	$ 50,000
Accumulated Amortization	42,245	$ 35,105
Spitfire [Member] | Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period		29 days
Gross Carrying Amount	400,000	$ 400,000
Accumulated Amortization	$ 400,000	$ 393,353

Goodwill And Intangible Asset48

Goodwill And Intangible Assets (Estimated Aggregate Amortization Expense) (Details) - USD ($)	Apr. 30, 2018	Apr. 30, 2017
Goodwill And Intangible Assets [Abstract]
For the fiscal year ending April 30, 2019	$ 374,725
For the fiscal year ending April 30, 2020	362,410
For the fiscal year ending April 30, 2021	354,203
For the fiscal year ending April 30, 2022	346,582
For the fiscal year ending April 30, 2023	339,128
Thereafter	1,311,037
Total	$ 3,088,085	$ 4,213,235

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details)

Jul. 16, 2018USD ($)

Feb. 12, 2018USD ($)

Dec. 21, 2017USD ($)

Oct. 01, 2017USD ($)

Jun. 01, 2017USD ($)

Mar. 31, 2017USD ($)

Mar. 30, 2017USD ($)

Mar. 24, 2017CNY (¥)

Feb. 01, 2017USD ($)

Nov. 01, 2016USD ($)

Aug. 04, 2015CNY (¥)

Nov. 24, 2014USD ($)

Oct. 24, 2013USD ($)

Jan. 08, 2010USD ($)

Apr. 30, 2018USD ($)

Apr. 30, 2018USD ($)

Apr. 30, 2016

Jul. 31, 2015USD ($)

Jun. 30, 2017USD ($)

Apr. 30, 2017USD ($)

Debt Instrument [Line Items]

Deferred financing costs

$ 319,332

$ 319,332

$ 208,583

Equipment refinanced through leasing transaction

6,618,384

6,618,384

Payments under capital lease

7,231,546

7,231,546

Other long-term liabilities

1,130,557

1,130,557

991,017

Associated Bank, National Association [Member] | Capital Lease And Sale Leaseback Agreements [Member] | Equipment [Member]

Debt Instrument [Line Items]

Total equipment purchased under the capital lease

$ 6,893,596

Outstanding amount under capital lease

2,923,524

2,923,524

3,627,760

Net book value of capital leased assets

4,799,827

4,799,827

4,713,044

CIT Finance LLC [Member] | Capital Lease And Sale Leaseback Agreements [Member] | Equipment [Member]

Debt Instrument [Line Items]

Total equipment purchased under the capital lease

$ 2,512,051

Outstanding amount under capital lease

984,031

984,031

1,448,269

Net book value of capital leased assets

1,736,688

1,736,688

1,946,026

First American Equipment Finance [Member] | Capital Lease And Sale Leaseback Agreements [Member] | Equipment [Member]

Debt Instrument [Line Items]

Total equipment purchased under the capital lease

3,011,387

Outstanding amount under capital lease

2,688,029

2,688,029

Net book value of capital leased assets

2,808,209

2,808,209

Wells Fargo Bank [Member] | Notes Payable - Buildings [Member] | Corporate Headquarters And Manufacturing Facility [Member]

Debt Instrument [Line Items]

Mortgage agreement, amount

$ 2,500,000

Mortgage agreement, interest rate

2.25%

Mortgage agreement, final payment

$ 2,289,500

Mortgage agreement, maturity date

Nov. 8, 2019

Mortgage agreement, monthly principal payment

$ 9,500

Mortgage agreement, payable period

60 months

Mortgage agreement, outstanding amount

2,574,500

Wells Fargo Bank [Member] | Notes Payable - Buildings [Member] | Corporate Headquarters And Manufacturing Facility [Member] | Proceeds From U.S. Bank Mortgage Agreement [Member]

Debt Instrument [Line Items]

Mortgage agreement, amount repaid

$ 2,498,500

Wells Fargo Bank [Member] | Notes Payable - Buildings [Member] | Engineering And Design Center [Member]

Debt Instrument [Line Items]

Mortgage agreement, amount

$ 1,275,000

Mortgage agreement, interest rate

4.50%

Mortgage agreement, final payment

$ 1,030,000

Mortgage agreement, maturity date

Oct. 1, 2018

Mortgage agreement, monthly principal payment

$ 4,250

Mortgage agreement, payable period

60 months

Mortgage agreement, outstanding amount

1,096,500

Wells Fargo Bank [Member] | Notes Payable - Buildings [Member] | Engineering And Design Center [Member] | Proceeds From U.S. Bank Mortgage Agreement [Member]

Debt Instrument [Line Items]

Mortgage agreement, amount repaid

1,062,500

Wells Fargo Bank [Member] | Senior Secured Credit Facility [Member] | Notes Payable - Banks [Member]

Debt Instrument [Line Items]

Credit facility credit limit

$ 30,000,000

Expiration date

Oct. 31, 2018

Equity ownership in foreign entities pledged as collateral, percentage

65.00%

Deferred financing costs

68,475

Outstanding balance under the credit facility

$ 22,232,914

U.S. Bank [Member] | Notes Payable - Buildings [Member] | Corporate Headquarters And Manufacturing Facility [Member]

Debt Instrument [Line Items]

Deferred financing costs

74,066

74,066

Unamortized amount included in other assets

66,945

66,945

Mortgage agreement, amount

$ 5,200,000

Mortgage agreement, interest rate

4.00%

Mortgage agreement, final payment

4,347,778

$ 4,347,778

Mortgage agreement, maturity date

Mar. 31, 2022

Mortgage agreement, monthly principal payment

$ 17,333

Mortgage agreement, payable period

51 months

Mortgage agreement, outstanding amount

5,148,000

$ 5,148,000

U.S. Bank [Member] | Mortgage Agreement [Member] | Engineering And Design Center [Member]

Debt Instrument [Line Items]

Deferred financing costs

65,381

65,381

Unamortized amount included in other assets

59,094

59,094

Mortgage agreement, amount

$ 1,800,000

Mortgage agreement, interest rate

4.00%

Mortgage agreement, final payment

1,505,000

$ 1,505,000

Mortgage agreement, maturity date

Mar. 31, 2022

Mortgage agreement, monthly principal payment

$ 6,000

Mortgage agreement, payable period

51 months

Mortgage agreement, outstanding amount

$ 1,782,000

$ 1,782,000

U.S. Bank [Member] | Senior Secured Credit Facility [Member] | Notes Payable - Banks [Member]

Debt Instrument [Line Items]

Credit facility credit limit

$ 35,000,000

Expiration date

Mar. 31, 2022

Fixed interest rate

4.00%

Variable interest rate

1.50%

Effective interest rate

3.83%

3.83%

Deferred financing costs

$ 34,971

$ 34,971

207,647

Unamortized amount included in other assets

192,502

192,502

204,186

Outstanding balance under the credit facility

29,279,631

29,279,631

23,178,429

Unused availability under the credit facility

5,720,369

5,720,369

11,821,571

U.S. Bank [Member] | Credit Facility [Member] | Notes Payable - Banks [Member] | Subsequent Event [Member]

Debt Instrument [Line Items]

Fixed charge coverage ratio

1.20%

Sublimits on inventory

$ 17,500,000

Sublimits on finished goods

25,000,000

Engencap Fin S.A. DE C.V. [Member] | Notes Payable - Equipment 1 [Member] | Equipment [Member]

Debt Instrument [Line Items]

Fixed interest rate

6.65%

Secured note agreement amount

$ 596,987

Term extended agreement date

Nov. 1, 2021

Average quarterly payment under secured note agreement

$ 35,060

Secured note agreement, first payment date

Feb. 1, 2017

Outstanding amount under note agreement

447,741

447,741

567,138

Engencap Fin S.A. DE C.V. [Member] | Notes Payable - Equipment 2 [Member] | Equipment [Member]

Debt Instrument [Line Items]

Fixed interest rate

7.35%

Secured note agreement amount

$ 335,825

Term extended agreement date

Feb. 1, 2022

Average quarterly payment under secured note agreement

$ 20,031

Secured note agreement, first payment date

May 1, 2017

Outstanding amount under note agreement

268,660

268,660

335,825

Engencap Fin S.A. DE C.V. [Member] | Notes Payable - Equipment 3 [Member] | Equipment [Member]

Debt Instrument [Line Items]

Fixed interest rate

7.35%

Secured note agreement amount

$ 636,100

Term extended agreement date

Jun. 1, 2022

Average quarterly payment under secured note agreement

$ 37,941

Secured note agreement, first payment date

Sep. 1, 2017

Outstanding amount under note agreement

540,685

540,685

Engencap Fin S.A. DE C.V. [Member] | Notes Payable - Equipment 4 [Member] | Equipment [Member]

Debt Instrument [Line Items]

Fixed interest rate

7.35%

Secured note agreement amount

$ 307,036

Term extended agreement date

Nov. 1, 2022

Average quarterly payment under secured note agreement

$ 18,314

Secured note agreement, first payment date

Feb. 1, 2018

Outstanding amount under note agreement

$ 291,684

291,684

Minimum [Member] | Associated Bank, National Association [Member] | Capital Lease And Sale Leaseback Agreements [Member] | Equipment [Member]

Debt Instrument [Line Items]

Lease financing agreement date

Sep. 1, 2018

Payments under capital lease

$ 1,455

Fixed interest rate under capital lease

3.75%

Minimum [Member] | CIT Finance LLC [Member] | Capital Lease And Sale Leaseback Agreements [Member] | Equipment [Member]

Debt Instrument [Line Items]

Lease financing agreement date

Mar. 1, 2019

Payments under capital lease

$ 1,931

Fixed interest rate under capital lease

5.65%

Minimum [Member] | First American Equipment Finance [Member] | Capital Lease And Sale Leaseback Agreements [Member] | Equipment [Member]

Debt Instrument [Line Items]

Lease financing agreement date

Aug. 1, 2021

Payments under capital lease

$ 6,716

6,716

Fixed interest rate under capital lease

5.82%

Maximum [Member] | Associated Bank, National Association [Member] | Capital Lease And Sale Leaseback Agreements [Member] | Equipment [Member]

Debt Instrument [Line Items]

Lease financing agreement date

May 1, 2022

Payments under capital lease

$ 40,173

Fixed interest rate under capital lease

4.90%

Maximum [Member] | CIT Finance LLC [Member] | Capital Lease And Sale Leaseback Agreements [Member] | Equipment [Member]

Debt Instrument [Line Items]

Lease financing agreement date

Jul. 1, 2020

Payments under capital lease

$ 12,764

Fixed interest rate under capital lease

6.50%

Maximum [Member] | First American Equipment Finance [Member] | Capital Lease And Sale Leaseback Agreements [Member] | Equipment [Member]

Debt Instrument [Line Items]

Lease financing agreement date

Apr. 1, 2022

Payments under capital lease

$ 20,093

20,093

Fixed interest rate under capital lease

7.23%

Maximum [Member] | U.S. Bank [Member] | Credit Facility [Member] | Notes Payable - Banks [Member] | Subsequent Event [Member]

Debt Instrument [Line Items]

Credit facility credit limit

$ 45,000,000

Foreign Subsidiaries [Member]

Debt Instrument [Line Items]

Other long-term liabilities

$ 1,052,082

$ 1,052,082

913,827

Wujiang SigmaTron Electronics Co [Member] | Foreign Subsidiaries [Member] | China Construction Bank [Member] | Credit Facility [Member] | Notes Payable - Banks [Member]

Debt Instrument [Line Items]

Credit facility credit limit | ¥

¥ 5,000,000

Expiration date

Aug. 3, 2017

Closed credit facility date

Mar. 1, 2017

Fixed interest rate

6.67%

SigmaTron Electronic Technology Co [Member] | Foreign Subsidiaries [Member] | China Construction Bank [Member] | Credit Facility [Member] | Notes Payable - Banks [Member]

Debt Instrument [Line Items]

Credit facility credit limit

$ 5,000,000

¥ 9,000,000

Expiration date

Feb. 7, 2019

Feb. 7, 2018

Closed credit facility date

Feb. 11, 2018

Fixed interest rate

6.09%

6.09%

Outstanding balance under the credit facility

$ 0

$ 0

$ 0

Long-Term Debt (Aggregate Amoun

Long-Term Debt (Aggregate Amount of Debt, Net Deferred Financing Fees) (Details)	Apr. 30, 2018USD ($)
Long-Term Debt [Abstract]
2,019	$ 655,190
2,020	655,190
2,021	655,190
2,022	35,473,499
Total	$ 37,439,069

Accrued Expenses And Wages (Sch

Accrued Expenses And Wages (Schedule of Accrued Expenses) (Details) - USD ($)	Apr. 30, 2018	Apr. 30, 2017
Accrued Expenses And Wages [Abstract]
Interest	$ 121,845	$ 90,639
Commissions	187,936	143,738
Professional fees	322,377	419,801
Other - Purchases	156,634	117,069
Other	2,142,000	1,550,808
Accrued expenses, total	$ 2,930,792	$ 2,322,055

Accrued Expenses And Wages (S52

Accrued Expenses And Wages (Schedule of Accrued Wages) (Details) - USD ($)	Apr. 30, 2018	Apr. 30, 2017
Accrued Expenses And Wages [Abstract]
Wages	$ 1,945,142	$ 1,785,078
Bonuses	467,306	819,207
Foreign wages	1,318,307	1,885,317
Accrued wages, total	$ 3,730,755	$ 4,489,602

Income Tax (Narrative) (Details

Income Tax (Narrative) (Details) - USD ($)	4 Months Ended	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2018	Dec. 31, 2017	Apr. 30, 2017
Income Tax [Line Items]
Foreign tax credit	$ 78,100	$ 78,100		$ 78,100
Federal tax rate	21.00%		35.00%
Unrecognized tax benefits	$ 0	0		0
Other tax expense		0		$ 0
Increase in income tax expense		25,000
Provisional income tax expense		566,000
Provisional income tax expense, foreign subsidiaries	541,000	541,000
Long-term liability related to Tax Act	70,000	70,000
Federal [Member]
Income Tax [Line Items]
Net operating loss carryforwards	1,068,000	1,068,000
State [Member]
Income Tax [Line Items]
Net operating loss carryforwards	976,000	$ 976,000
Net operating loss carryforwards expire date		Apr. 30, 2025
Foreign [Member]
Income Tax [Line Items]
Net operating loss carryforwards	1,825,000	$ 1,825,000
Net operating loss carryforwards expire date		Apr. 30, 2023
Cumulative amount of unremitted earnings	13,085,000	$ 13,085,000
Tax credit carryforwards	$ 78,100	$ 78,100

Income Tax ((Loss) Income befor

Income Tax ((Loss) Income before Income Tax (Benefit) Expense) (Detail) - USD ($)

3 Months Ended

12 Months Ended

Apr. 30, 2018

[1],[2]

Jan. 31, 2018

[1],[2]

Oct. 31, 2017

[1],[2]

Jul. 31, 2017

[1],[2]

Apr. 30, 2017

[3],[4],[5]

Jan. 31, 2017

[3],[4],[5]

Oct. 31, 2016

[3],[4],[5]

Jul. 31, 2016

[3],[4],[5]

Apr. 30, 2018

Apr. 30, 2017

Income Tax [Abstract]

Domestic

$ (5,906,596)

$ 1,326,266

Foreign

1,604,274

1,171,417

(Loss) income before income taxes

$ (5,918,749)

$ (115,872)

$ 1,151,454

$ 580,845

$ 2,155,173

$ 89,036

$ 26,616

$ 226,858

$ (4,302,322)

$ 2,497,683

[1]

The Company recognized a full goodwill impairment charge of $3,222,899, an impairment of intangible assets in the amount of $690,107 and the write off of the account receivable and note receivable related to Petzila in the amount of $2,509,423.

[2]

The Company records inventory reserves for valuation and shrinkage throughout the year based on historical data. In the fourth quarter of fiscal 2018 physical inventory results were completed resulting in an increase in income before income taxes of approximately $1,500,000.

[3]

As discussed in Note G, during the fourth quarter of fiscal 2017 the Company recorded a change in estimate related to Contingent Consideration which increased income before income tax expense in the amount of approximately $247,000.

[4]

Due to a fire at one of the Company's plants during 2017, the Company recorded expense of approximately $230,000 in prior quarters in costs of goods sold that was realized as an insurance recovery during the fourth quarter of 2017 as recovery was considered probable. As part of this settlement, a gain of approximately $277,000 was also recorded in the fourth quarter of fiscal 2017 due to the insurance claim exceeding the net book value of the replacement machinery and equipment destroyed.

[5]

The Company records inventory reserves for valuation and shrinkage throughout the year based on historical data. In the fourth quarter of fiscal 2017 physical inventory results were completed and the Company adjusted the estimate which increased income before income taxes by approximately $780,000.

Income Tax (Income Tax Provisio

Income Tax (Income Tax Provision) (Details) - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Current
Federal	$ 433,291	$ 501,226
State	28,296	13,697
Foreign	712,846	589,913
Total Current	1,174,433	1,104,836
Deferred
Federal	(1,551,921)	(54,213)
State	(240,647)	59,884
Foreign	(442,317)	(3,030)
Total Deferred	(2,234,885)	2,641
Provision for income taxes	$ (1,060,452)	$ 1,107,477

Income Tax (Reconciliation of I

Income Tax (Reconciliation of Income Taxes) (Details) - USD ($)	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
U.S. Federal Provision:
At statutory rate	$ (1,325,872)	$ 849,215
State taxes	(151,508)	42,643
Change in valuation allowance		78,100
Foreign tax differential	60,302	(89,885)
Impact of state tax rate change	3,670	5,920
Impact of foreign permanent items	23,106	7,171
Tax law changes	581,222	28,599
Foreign currency exchange gain/loss	(172,062)	328,239
Foreign inflation adjustment	(129,227)	(61,707)
Stock based compensation	49,917	(80,818)
Provision for income taxes	$ (1,060,452)	$ 1,107,477

Income Tax (Deferred Tax Assets

Income Tax (Deferred Tax Assets and Liabilities) (Details) - USD ($)	Apr. 30, 2018	Apr. 30, 2017
Deferred Tax Assets
Federal, foreign & state NOL carryforwards	$ 730,561	$ 29,168
Foreign tax credit	78,100	78,100
Reserves and accruals	598,364	723,313
Stock based compensation	314,221	462,156
Inventory	869,471	1,177,067
Other intangibles	834,512	206,736
Deferred rent	114,171	211,509
Allowance for doubtful accounts	76,500	38,360
Other DTA		13,839
Federal benefit of state		45,589
Total Gross Deferred Tax Assets	3,615,900	2,985,837
Less: Valuation allowance	(78,100)	(78,100)
Net Deferred Tax Assets	3,537,800	2,907,737
Deferred Tax Liabilities
Other assets	(3,485)	(318,830)
Property, machinery & equipment	(2,198,332)	(3,441,393)
Prepaids	(203,924)	(272,718)
Federal benefit of state	(22,378)
Total Deferred Tax Liabilities	(2,428,119)	(4,032,941)
Net Deferred Tax Asset	$ 1,109,681
Net Deferred Tax Liability		$ (1,125,204)

401(k) Retirement Savings Plan

401(k) Retirement Savings Plan (Narrative) (Details)	12 Months Ended
	Apr. 30, 2018USD ($)$ / employee	Apr. 30, 2017USD ($)
Retirement Plans [Line Items]
Amount contributed towards retirement plans	$ 90,744	$ 91,686
Plan administration incurred total expenses	$ 12,700	$ 8,000
Maximum [Member]
Retirement Plans [Line Items]
Annual contributions to be matched by employer | $ / employee	300

Major Customers and Concentra59

Major Customers and Concentration of Credit Risk (Narrative) (Details)	12 Months Ended
	Apr. 30, 2018USD ($)customer	Apr. 30, 2017customer	May 01, 2015USD ($)
Concentration Risk [Line Items]
Number of customers accounted for net sales and account receivable | customer	2	2
China [Member]
Concentration Risk [Line Items]
Cash	$ 1,325,149
Cash insured amount from deposit insurance program			$ 81,000
Major Customer One [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk from major customer, percentage	20.20%	26.70%
Major Customer One [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk from major customer, percentage	6.00%	8.40%
Major Customer Two [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Concentration risk from major customer, percentage	13.30%	12.60%
Major Customer Two [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk from major customer, percentage	2.90%	4.20%

Leases (Narrative) (Details)

Leases (Narrative) (Details)	May 31, 2012ft²	Sep. 30, 2010USD ($)ft²	Apr. 30, 2018USD ($)	Apr. 30, 2017USD ($)
Leases Disclosure [Line Items]
Rent expense under operating leases			$ 2,391,328	$ 2,363,778
Union City, CA [Member]
Leases Disclosure [Line Items]
Number of square feet of manufacturing and office space | ft²		117,000
Extended lease agreement period		Mar. 1, 2021
Deferred rent income			103,599	79,575
Incentives related to lease		$ 418,000
Deferred rent			447,073	550,672
Tijuana, MX [Member]
Leases Disclosure [Line Items]
Number of square feet of manufacturing and office space | ft²	112,000
Extended lease agreement period	Nov. 1, 2018
Deferred rent income			139,437	127,967
Deferred rent			$ 85,527	$ 224,964

Leases (Future Minimum Lease Pa

Leases (Future Minimum Lease Payments under Leases) (Details) - USD ($)	Apr. 30, 2018	Apr. 30, 2017
Capital Leases
2,019	$ 2,685,337
2,020	2,041,239
2,021	1,618,137
2,022	874,589
2,023	12,244
Total future minimum lease payments	7,231,546
Less amounts representing interest	613,162
Capital lease obligation	6,618,384
Less Current Portion	2,320,538	$ 1,711,204
Long Term Portion	4,297,846	$ 3,364,825
Operating Leases
2,019	2,326,475
2,020	1,860,538
2,021	1,371,245
2,022	707,338
2,023	685,986
Total future minimum lease payments	$ 6,951,582

Stock Compensation And Equity62

Stock Compensation And Equity Transactions (Narrative) (Details) - USD ($)	Oct. 01, 2016	Oct. 01, 2015	Feb. 01, 2014	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum term of options granted				10 years
Aggregate intrinsic value of options exercised				$ 35,820	$ 2,172
Aggregate intrinsic value of options outstanding				305,396	135,151
Value of shares issued under employee stock purchase plan					8,347
2014 Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted						25,000
Recognized stock-based compensation				0	3,500
Balance of unrecognized compensation expense related to stock options plans				$ 0	0
2016 Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted				285,000
Recognized stock-based compensation				$ 83,700	325,700
Balance of unrecognized compensation expense related to stock options plans				$ 0	$ 83,700
Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options eligible to purchase under the plan			500,000
Maximum number of shares of common stock purchasable in total by all participants in the ESPP			500,000
Number of shares released for issuance each fiscal year			25,000
Shares issued under employee stock purchase plan				0	1,658
Value of shares issued under employee stock purchase plan				$ 0	$ 3,559
Employees Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future issuance				117,914
Non Employee Director Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future issuance				0
Non Employee Director Plan [Member] | Restricted Stock [Member] | October 1, 2016 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized stock-based compensation				$ 0
Shares of restricted stock granted	12,500
Balance of unrecognized compensation expense related to restricted stock award				$ 0	0
Non Employee Director Plan [Member] | Restricted Stock [Member] | October 1, 2015 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized stock-based compensation					$ 60,649
Shares of restricted stock granted		11,250

Stock Compensation And Equity63

Stock Compensation And Equity Transactions (Summarized Option Activity) (Details) - $ / shares	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Number of securities to be issued upon exercise of outstanding options
Outstanding, beginning balance	366,763	367,963
Options exercised	(19,445)	(1,200)
Outstanding, ending balance	347,318	366,763
Weighted-average exercise price
Outstanding, Weighted-average exercise price, beginning balance	$ 5.85	$ 5.84
Options exercised, Weighted-average exercise price	4.94	3.60
Outstanding, Weighted-average exercise price, ending balance	$ 5.90	$ 5.85
Outstanding, Number of options exercisable at end of year	347,318	269,863	172,513

Stock Compensation And Equity64

Stock Compensation And Equity Transactions (Stock Options Outstanding, Exercisable, and Non-vested) (Details)	12 Months Ended
	Apr. 30, 2018$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number options outstanding and exercisable | shares	347,318
Weighted-average exercise price, outstanding and exercisable | $ / shares	$ 5.90
$3.60 - 6.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number options outstanding and exercisable | shares	347,318
Weighted-average remaining contract life, outstanding and exercisable	6 years 8 months 9 days
Weighted-average exercise price, outstanding and exercisable | $ / shares	$ 5.90

Selected Quarterly Financial 65

Selected Quarterly Financial Data (Unaudited) (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Selected Quarterly Financial Data (Unaudited) [Abstract]
Inventory adjustment	$ 1,500,000		$ 1,500,000
Impairment of goodwill			3,222,899
Impairment of intangible asset			690,107
Write off of account receivable and note receivable related to Petzila			$ 2,509,423
Insurance recovery expense		$ 230,000
Gain from involuntary conversion on non-monetary assets due to fire				$ 276,967
(Decrease) Increase basic earnings (loss) per share	$ (0.55)	$ 0.21

Selected Quarterly Financial 66

Selected Quarterly Financial Data (Unaudited) (Summary Of Quarterly Financial Data) (Details) - USD ($)	3 Months Ended																12 Months Ended
	Apr. 30, 2018		Jan. 31, 2018		Oct. 31, 2017		Jul. 31, 2017		Apr. 30, 2017		Jan. 31, 2017		Oct. 31, 2016		Jul. 31, 2016		Apr. 30, 2018	Apr. 30, 2017
Selected Quarterly Financial Data (Unaudited) [Abstract]
Net sales	$ 68,214,619		$ 65,733,723		$ 72,959,074		$ 71,224,293		$ 65,861,447		$ 62,164,167		$ 66,159,586		$ 59,184,975		$ 278,131,709	$ 253,370,175
Gross profit	6,844,956		5,897,340		7,103,568		6,757,054		7,899,446	[1]	5,686,959	[1]	5,818,669	[1]	5,770,234	[1]	26,602,918	25,175,308
Income before income taxes	(5,918,749)	[2],[3]	(115,872)	[2],[3]	1,151,454	[2],[3]	580,845	[2],[3]	2,155,173	[1],[4],[5]	89,036	[1],[4],[5]	26,616	[1],[4],[5]	226,858	[1],[4],[5]	(4,302,322)	2,497,683
Net income (loss)	$ (4,392,205)		$ 31,338		$ 736,115		$ 382,882		$ 1,258,166		$ (47,852)		$ 33,295		$ 146,597		$ (3,241,870)	$ 1,390,206
Earnings (loss) per share, Basic	$ (1.04)		$ 0.01		$ 0.17		$ 0.09		$ 0.30		$ (0.01)		$ 0.01		$ 0.04		$ (0.77)	$ 0.33
Earnings (loss) per share, Diluted	$ (1.04)		$ 0.01		$ 0.17		$ 0.09		$ 0.30		$ (0.01)		$ 0.01		$ 0.03		$ (0.77)	$ 0.33
Weighted-average shares, Basic	4,215,258		4,209,566		4,201,442		4,195,985		4,188,279		4,186,813		4,185,752		4,183,955		4,205,483	4,186,183
Weighted average shares- Diluted	4,215,258		4,356,509		4,326,854		4,269,501		4,207,266		4,186,813		4,225,874		4,214,535		4,205,483	4,213,592
[1]	Due to a fire at one of the Company's plants during 2017, the Company recorded expense of approximately $230,000 in prior quarters in costs of goods sold that was realized as an insurance recovery during the fourth quarter of 2017 as recovery was considered probable. As part of this settlement, a gain of approximately $277,000 was also recorded in the fourth quarter of fiscal 2017 due to the insurance claim exceeding the net book value of the replacement machinery and equipment destroyed.
[2]	The Company recognized a full goodwill impairment charge of $3,222,899, an impairment of intangible assets in the amount of $690,107 and the write off of the account receivable and note receivable related to Petzila in the amount of $2,509,423.
[3]	The Company records inventory reserves for valuation and shrinkage throughout the year based on historical data. In the fourth quarter of fiscal 2018 physical inventory results were completed resulting in an increase in income before income taxes of approximately $1,500,000.
[4]	As discussed in Note G, during the fourth quarter of fiscal 2017 the Company recorded a change in estimate related to Contingent Consideration which increased income before income tax expense in the amount of approximately $247,000.
[5]	The Company records inventory reserves for valuation and shrinkage throughout the year based on historical data. In the fourth quarter of fiscal 2017 physical inventory results were completed and the Company adjusted the estimate which increased income before income taxes by approximately $780,000.