Clearfield (CLFD) 10-K 10 Nov 21 2021 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2021	Nov. 01, 2021	Mar. 31, 2021
Document Information [Line Items]
Entity Central Index Key	0000796505
Entity Registrant Name	Clearfield, Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	0-16106
Entity Incorporation, State or Country Code	MN
Entity Tax Identification Number	41-1347235
Entity Address, Address Line One	7050 Winnetka Avenue North Suite 100
Entity Address, City or Town	Brooklyn Park
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	55428
City Area Code	763
Local Phone Number	476-6866
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	CLFD
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 338,805,975
Entity Common Stock, Shares Outstanding		13,732,188

Balance Sheets

Balance Sheets - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Current Assets
Cash and cash equivalents	$ 13,216,281	$ 16,449,636
Short-term investments	10,373,831	10,582,527
Accounts receivables, net	19,437,879	10,496,672
Inventories, net	27,524,311	14,408,538
Other current assets	953,945	585,436
Total current assets	71,506,247	52,522,809
Property, plant and equipment, net	4,997,658	4,952,819
Other Assets
Long-term investments	36,912,777	25,143,000
Goodwill	4,708,511	4,708,511
Intangible assets, net	4,696,151	4,986,216
Right of use lease assets	2,305,413	2,539,100
Deferred tax asset	365,467	178,118
Other	418,976	266,857
Total other assets	49,407,295	37,821,802
Total Assets	125,911,200	95,297,430
Current Liabilities
Current portion of lease liability	914,565	665,584
Accounts payable	9,214,782	3,689,587
Accrued compensation	8,729,293	4,856,885
Accrued expenses	1,612,833	1,202,753
Total current liabilities	20,471,473	10,414,809
Other Liabilities
Long-term portion of lease liability	1,615,369	2,129,343
Total liabilities	22,086,842	12,544,152
Shareholders’ Equity
Preferred stock, $.01 par value; 500,000 shares; no shares issued or outstanding	0	0
Common stock, authorized 50,000,000, $.01 par value; 13,732,188 and 13,649,962 shares issued and outstanding as of September 30, 2021 and 2020, respectively	137,322	136,500
Additional paid-in capital	58,245,783	57,502,905
Retained earnings	45,441,253	25,113,873
Total shareholders’ equity	103,824,358	82,753,278
Total Liabilities and Shareholders’ Equity	$ 125,911,200	$ 95,297,430

Balance Sheets (Parentheticals)

Balance Sheets (Parentheticals) - $ / shares	Sep. 30, 2021	Sep. 30, 2020
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares (in shares)	500,000	500,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, authorized (in shares)	50,000,000	50,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	13,732,188	13,649,962
Common stock, shares outstanding (in shares)	13,732,188	13,649,962

Statements of Earnings

Statements of Earnings - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net sales	$ 140,755,399	$ 93,074,514
Cost of sales	79,577,506	55,160,316
Gross profit	61,177,893	37,914,198
Operating expenses
Selling, general and administrative	35,943,752	29,530,198
Income from operations	25,234,141	8,384,000
Interest income	500,120	770,950
Income before income taxes	25,734,261	9,154,950
Income tax expense	5,406,881	1,861,884
Net income	$ 20,327,380	$ 7,293,066
Net income per share Basic (in dollars per share)	$ 1.48	$ 0.53
Net income per share Diluted (in dollars per share)	$ 1.47	$ 0.53
Weighted average shares outstanding:
Basic (in shares)	13,720,699	13,643,355
Diluted (in shares)	13,784,293	13,643,355

Statements of Shareholders' Equ

Statements of Shareholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Sep. 30, 2019	13,641,805
Balance at Sep. 30, 2019	$ 136,418	$ 56,976,162	$ 17,820,807	$ 74,933,387
Stock-based compensation expense	$ 0	773,555	0	773,555
Repurchase of common stock (in shares)	(41,796)
Repurchase of common stock	$ (418)	(428,236)	0	(428,654)
Restricted stock issuance, net of forfeitures (in shares)	8,580
Restricted stock issuance, net of forfeitures	$ 86	(86)	0	0
Issuance of common stock under employee stock purchase plan (in shares)	30,223
Issuance of common stock under employee stock purchase plan	$ 302	348,474	0	348,776
Exercise of stock options, net of shares exchanged for payment (in shares)	21,188
Exercise of stock options, net of shares exchanged for payment	$ 212	9,352	0	9,564
Repurchase of shares for payment of withholding taxes for vested restricted stock grants (in shares)	(10,038)
Repurchase of shares for payment of withholding taxes for vested restricted stock grants	$ (100)	(176,316)	0	(176,416)
Net income	$ 0	0	7,293,066	7,293,066
Balance (in shares) at Sep. 30, 2020	13,649,962
Balance at Sep. 30, 2020	$ 136,500	57,502,905	25,113,873	82,753,278
Stock-based compensation expense	$ 0	1,280,135	0	1,280,135
Restricted stock issuance, net of forfeitures (in shares)	35,609
Restricted stock issuance, net of forfeitures	$ 356	(356)	0	0
Issuance of common stock under employee stock purchase plan (in shares)	24,750
Issuance of common stock under employee stock purchase plan	$ 247	383,450	0	383,697
Exercise of stock options, net of shares exchanged for payment (in shares)	33,621
Exercise of stock options, net of shares exchanged for payment	$ 337	(458,354)	0	(458,017)
Repurchase of shares for payment of withholding taxes for vested restricted stock grants (in shares)	(11,754)
Repurchase of shares for payment of withholding taxes for vested restricted stock grants	$ (118)	(461,997)	0	(462,115)
Net income	$ 0	0	20,327,380	20,327,380
Balance (in shares) at Sep. 30, 2021	13,732,188
Balance at Sep. 30, 2021	$ 137,322	$ 58,245,783	$ 45,441,253	$ 103,824,358

Statements of Cash Flows

Statements of Cash Flows - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net income	$ 20,327,380	$ 7,293,066
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	2,301,803	2,421,754
Change in allowance for doubtful accounts	209,612	0
Amortization of discount on investments	(7,326)	(64,327)
Deferred taxes	(187,349)	(279,808)
Loss on disposal of assets	0	5,785
Stock-based compensation	1,280,135	773,555
Changes in operating assets and liabilities:
Accounts receivable	(9,150,819)	(1,378,033)
Inventories, net	(13,115,773)	(5,395,558)
Other assets	(531,201)	127,773
Accounts payable and accrued expenses	9,776,377	3,151,566
Net cash provided by operating activities	10,902,839	6,655,773
Cash flows from investing activities
Purchases of property, plant and equipment and intangible assets	(2,046,004)	(1,806,198)
Purchases of investments	(24,808,755)	(34,056,930)
Proceeds from maturities of investments	13,255,000	35,822,000
Net cash used in investing activities	(13,599,759)	(41,128)
Cash flows from financing activities
Proceeds from issuance of common stock under employee stock purchase plan	383,697	348,776
Tax withholding and proceeds related to exercise of stock options	(458,017)	9,564
Tax withholding related to vesting of restricted stock grants	(462,115)	(176,416)
Repurchase of common stock	0	(428,654)
Net cash used in financing activities	(536,435)	(246,730)
Increase (Decrease) in cash and cash equivalents	(3,233,355)	6,367,915
Cash and cash equivalents, beginning of year	16,449,636	10,081,721
Cash and cash equivalents, end of year	13,216,281	16,449,636
Supplemental disclosures for cash flow information
Cash paid during the year for income taxes	5,504,985	1,442,079
Non-cash financing activities
Cashless exercise of stock options	$ 1,271,472	$ 97,811

Note 1 - Summary of Significant

Note 1 - Summary of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2021
Notes to Financial Statements
Significant Accounting Policies [Text Block]	NOTE 1 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Description of Business: Revenue Recognition: Cash and Cash Equivalents: three September 30, 2021 2020 The Company maintains cash balances at multiple financial institutions, and at times, such balances exceed insured limits. The Company has not not Investments: not five three September 30, 2021 September 30, 2020 Less than one year $ 10,373,831 $ 10,582,527 1-5 years 36,912,777 25,143,000 Total $ 47,286,608 $ 35,725,527 Fair Value of Financial Instruments: Accounts Receivable: not not The allowance for doubtful accounts activity for the years ended September 30, 2021 2020 Year Ended Balance at Beginning of Year Additions (Recoveries) Charged to Costs and Expenses Less Write-offs Balance at End of Year September 30, 2021 $ 289,085 $ (209,612 ) $ - $ 79,473 September 30, 2020 $ 289,085 $ - $ - $ 289,085 Inventories: first first September 30, 2021 September 30, 2020 Raw materials $ 23,071,833 $ 12,287,134 Work-in-process 2,481,890 1,033,021 Finished goods 3,361,576 2,048,514 Inventories, gross 28,915,299 15,368,669 Inventory reserve (1,390,988 ) (960,131 ) Inventories, net $ 27,524,311 $ 14,408,538 On a regular basis, the Company reviews its inventory and identifies that which is excess, slow moving, and obsolete by considering factors such as inventory levels, expected product life, and forecasted sales demand. A reserve is established for any identified excess, slow moving, and obsolete inventory down to its net realizable value through a charge to cost of sales. Inventory write-down charges may not not Property, Plant and Equipment: Estimated useful lives of the assets are as follows: Years Equipment 3 – 7 Leasehold improvements 7-10 or life of lease Vehicles 3 Property, plant and equipment consist of the following: September 30, 2021 September 30, 2020 Manufacturing equipment $ 9,178,935 $ 8,171,497 Office equipment 2,901,385 2,478,056 Leasehold improvements 2,589,777 2,576,861 Vehicles 245,903 245,903 Construction in progress 150,343 19,143 Property, plant and equipment, gross 15,066,343 13,491,460 Less accumulated depreciation 10,068,685 8,538,641 Property, plant and equipment, net $ 4,997,658 $ 4,952,819 Depreciation expense for the years ended September 30, 2021 2020 Goodwill and Intangible Assets: fourth may not September 30, 2021 2020 no September 30, 2021 2020, no A significant reduction in our market capitalization or in the carrying amount of net assets of a reporting unit could result in an impairment charge. If the carrying amount of a reporting unit exceeds its fair value, the Company would measure the possible goodwill impairment loss based on an allocation of the estimate of fair value of the reporting unit to all of the underlying assets and liabilities of the reporting unit, including any previously unrecognized intangible assets. The excess of the fair value of a reporting unit over the amounts assigned to its assets and liabilities is the implied fair value of goodwill. An impairment loss is recognized to the extent that a reporting unit's recorded goodwill exceeds the implied fair value of goodwill. An impairment loss would be based on significant estimates and judgments, and if the facts and circumstances change, a potential impairment could have a material impact on the Company’s financial statements. No impairment of goodwill has occurred during the years ended September 30, 2021 2020, The Company capitalizes legal costs incurred to obtain patents. Once accepted by either the U.S. Patent Office or the equivalent office of a foreign country, these legal costs are amortized using the straight-line method over the remaining estimated lives, not September 30, 2021, In addition, the Company has various finite life intangible assets, most of which were acquired as a result of the acquisition of a portfolio of Telcordia certified outdoor active cabinet products from Calix, Inc. (“Calix”) during fiscal year 2018. September 30, 2021 2020 September 30, 2021 Years Gross Carrying Amount Accumulated Amortization Net Book Value Amount Customer relationships 15 $ 3,742,000 $ 904,317 $ 2,837,683 Certifications 8 1,068,000 483,937 584,063 Trademarks 8 563,000 255,109 307,891 Patents 20 790,384 84,660 705,724 Other 5 31,091 24,873 6,218 Software 1 - 3 1,959,670 1,705,098 254,572 Totals $ 8,154,145 $ 3,457,994 $ 4,696,151 September 30, 2020 Years Gross Carrying Amount Accumulated Amortization Net Book Value Amount Customer relationships 15 $ 3,742,000 $ 654,850 $ 3,087,150 Certifications 8 1,068,000 350,437 717,563 Trademarks 8 563,000 184,734 378,266 Patents 20 689,889 56,257 633,632 Other 5 31,091 18,655 12,436 Software 1 - 3 1,695,559 1,538,390 157,169 Totals $ 7,789,539 $ 2,803,323 $ 4,986,216 Amortization expense related to these assets for the years ended September 30, 2021 2020 Our future estimated amortization expense for intangibles as follows as of September 30, 2021: Estimated amortization expense FY 2022 $ 592,192 FY 2023 531,237 FY 2024 497,387 FY 2025 453,342 FY 2026 325,920 Total $ 2,400,078 Impairment of Long-Lived Assets: may not not not Any required impairment loss is measured as the amount by which the carrying amount of a long-lived asset or asset group exceeds its fair value and is recorded as a reduction in the carrying value of the related asset or asset group and a charge to operating results. No impairment of long-lived assets occurred during the years ended September 30, 2021 2020, Income Taxes: not not In accounting for uncertainty in income taxes, we recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not not 50 September 30, 2021 September 30, 2020, not not 12 Stock-Based Compensation not The expected terms of the options are based on evaluations of historical and expected future employee exercise behavior. The risk-free interest rate is based on the U.S. Treasury rates at the date of grant with maturity dates approximately equal to the expected life at grant date. Volatility is based on historical and expected future volatility of the Company’s stock. The Company has not not If factors change and we employ different assumptions in the determination of the fair value of grants in future periods, the related compensation expense that we record may Research and Development Costs September 30, 2021 2020, Advertising Costs September 30, 2021 2020, Net Income Per Share: Weighted average common shares outstanding for the years ended September 30, 2021 2020 Year ended September 30, 2021 2020 Net income $ 20,327,380 $ 7,293,066 Weighted average common shares 13,720,699 13,643,355 Dilutive potential common shares 63,594 - Weighted average dilutive common shares outstanding 13,784,293 13,643,355 Earnings per share: Basic $ 1.48 $ 0.53 Diluted $ 1.47 $ 0.53 There were no September 30, 2021 September 30, 2020, Use of Estimates: may For the purposes of comparability, certain prior period amounts have been reclassified to conform to current period classification. There was no New Accounting Pronouncements: In January 2017, 2017 04, Intangibles-Goodwill 2 December 15, 2019. first 2021. 2017 04 first 2021 not In June 2016, 2016 13, Measurement of Credit Losses on Financial Instruments November 2018, 2018 19 2016 13. first 2023, 2016 13

Note 2 - Shareholders' Equity

Note 2 - Shareholders' Equity	12 Months Ended
	Sep. 30, 2021
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	NOTE 2 SHAREHOLDERS EQUITY Share Repurchase Program: November 13, 2014, April 25, 2017, not April 2020, 19 September 30, 2021, The Company is authorized to issue 50,000,000 shares of common stock at $.01 may, may Stock-Based Compensation: The Company currently has one 2007 2007 September 30, 2021. September 30, 2021, September 30, 2021 2020 September 30, 2021, September 30, 2020, Stock Options: September 30, 2021, five three September 30, 2020, Year ended September 30, 2021 Year ended September 30, 2020 Dividend yield 0% 0% Weighted average expected volatility 46.9% 39.5 - 44.9% Weighted average risk-free interest rate 0.24% 0.24 - 1.69% Weighted average expected life (years) 5 4 - 6 Vesting period (years) 3 3 - 5 The expected stock price volatility is based on the historical volatility of the Company’s stock for a period approximating the expected life. The expected life represents the period of time that options are expected to be outstanding after their grant date. The risk-free interest rate reflects the interest rate at grant date on zero Options are generally granted at fair market values determined on the date of grant and vesting normally occurs over a three five six September 30, 2021 September 30, 2020. September 30, 2021, September 30, 2020, September 30, 2021 2020 Option transactions under the 2007 September 30, 2021 2020 Number of shares Weighted average exercise price Weighted average fair value Outstanding as of September 30, 2019 290,750 $ 11.86 Granted 121,350 12.43 $ 4.62 Exercised (26,750 ) 4.01 Forfeited and expired (48,250 ) 13.35 Outstanding as of September 30, 2020 337,100 $ 12.48 Granted 105,089 23.74 $ 8.14 Exercised (101,966 ) 12.47 Forfeited and expired (38,709 ) 13.68 Outstanding as of September 30, 2021 301,514 $ 16.25 The following table summarizes information concerning options exercisable under the 2007 Year ended Exercisable Weighted average remaining contractual life (years) Weighted average exercise price Aggregate intrinsic value September 30, 2021 51,201 2.29 $ 12.28 $ 1,631,575 September 30, 2020 97,333 2.19 $ 12.76 $ 720,826 The following table summarizes information concerning options currently outstanding at: Year Ended Number outstanding Weighted average remaining contractual life (years) Weighted average exercise price Aggregate intrinsic value September 30, 2021 301,514 3.22 $ 16.25 $ 8,411,728 September 30, 2020 337,100 3.43 $ 12.48 $ 720,831 Restricted Stock: 2007 one ten Restricted stock transactions during the years ended September 30, 2021 2020 Number of shares Weighted average grant date fair value Unvested shares as of September 30, 2019 130,440 $ 13.25 Granted 19,455 10.30 Vested (29,950 ) 13.36 Forfeited (10,875 ) 12.14 Unvested shares as of September 30, 2020 109,070 $ 12.98 Granted 39,807 24.20 Vested (35,840 ) 12.48 Forfeited (4,198 ) 15.45 Unvested shares as of September 30, 2021 108,839 $ 17.14 The fair value of restricted shares vested during the year end September 30, 2021 2020 September 30, 2021. September 30, 2020. Employee Stock Purchase Plan: 2010 may may no one six July 1 January 1 December 31, 2020 June 30, 2021, December 31, 2019 June 30, 2020, September 30, 2021, July 1, 2021. February 2020, June 30, 2021,

Note 3 - Income Taxes

Note 3 - Income Taxes	12 Months Ended
	Sep. 30, 2021
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 3 INCOME TAXES Components of income tax expense are as follows for the years ended: September 30, September 30, 2021 2020 Current: Federal $ 5,154,287 $ 1,966,491 State 439,944 175,201 Current income tax expense 5,594,231 2,141,692 Deferred: Federal (234,297 ) (252,929 ) State 46,947 (26,879 ) Deferred income tax expense (187,350 ) (279,808 ) Income tax expense $ 5,406,881 $ 1,861,884 The following is a reconciliation of the federal statutory income tax rate to the effective tax rate as a percent of pre-tax income for the following years ended: September 30, September 30, 2021 2020 Federal statutory rate 21.0 % 21.0 % State income taxes 2.2 % 2.0 % Permanent differences: Change in valuation allowance - (0.5% ) Expiration and utilization of state NOL’s - 0.4 % Research and development credits (0.7% ) (2.5% ) Excess tax expense (benefits) from stock-based compensation (1.5% ) (0.1% ) Tax rate 21.0 % 20.3 % As of September 30, 2021 2020, As of September 30, 2021 2020, September 30, 2020 2021 September 30, 2021. September 30, 2021, September 30, 2020, not not 2031. Significant components of deferred income tax assets and liabilities are as follows at: September 30, September 30, 2021 2020 Deferred income tax assets (liabilities): Intangibles $ (91,924 ) $ (86,319 ) Property and equipment depreciation (379,572 ) (419,896 ) Net operating loss carry forwards and credits 300,032 351,446 Stock-based compensation 230,553 169,730 Inventories 518,526 386,296 Prepaid expenses (48,505 ) (43,233 ) Accrued expenses and reserves 519,408 467,010 Goodwill (683,051 ) (646,916 ) Gross deferred tax asset (liability) 365,467 178,118 Valuation allowance - - Net deferred tax asset (liability) $ 365,467 $ 178,118 Realization of NOL carryforwards and other deferred tax temporary differences are contingent upon future taxable earnings. The Company’s deferred tax assets were reviewed for expected utilization by assessing the available positive and negative factors surrounding their recoverability. As of September 30, 2021 2020, no not The valuation allowance activity for the years ended September 30, 2021 2020 Year Ended Balance at Beginning of Year Income Tax Benefit Reversal for State NOL Expiration and Utilization Balance at End of Year September 30, 2021 $ - $ - $ - $ - September 30, 2020 $ 47,014 $ (5,235 ) $ (41,779 ) $ - The Company is required to recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not not 50 no not September 30, 2021 2020. The Company is subject to income taxes in the U.S. federal jurisdiction, and various state jurisdictions. Tax regulations within each jurisdiction are subject to the interpretation of the related tax laws and regulations and require significant judgment to apply. With few exceptions, the Company is no 2004. 2004

Note 4 - Concentrations

Note 4 - Concentrations	12 Months Ended
	Sep. 30, 2021
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	NOTE 4 CONCENTRATIONS Suppliers: third may may Customers: September 30, 2021 2020, not As of September 30, 2021, September 30, 2020, Disaggregation of Revenue The following table presents our domestic and international sales for each of the last two Year Ended September 30, 2021 2020 United States $ 131,285,349 $ 89,021,124 All Other Countries 9,470,050 4,053,390 Total Net Sales $ 140,755,399 $ 93,074,514 Clearfield sells its products to the Broadband Service Provider marketplace. In addition, the Company provides Legacy services for original equipment manufacturers requiring copper and fiber cable assemblies built to their specification.  The percentages of our sales by these markets were as follows for each of the last two Year Ended September 30, 2021 2020 Broadband service providers $ 98 % $ 96 % Legacy customers 2 % 4 % Total Net Sales $ 100 % $ 100 % Broadband Service Providers are made up of Community Broadband, which includes local and regional telecom companies, utilities, municipalities and alternative carriers, also referred to as Tier 2 3 1’s, Long-lived assets: September 30, 2021 2020,

Note 5 - Employee Benefit Plan

Note 5 - Employee Benefit Plan	12 Months Ended
	Sep. 30, 2021
Notes to Financial Statements
Retirement Benefits [Text Block]	NOTE 5 EMPLOYEE BENEFIT PLAN The Company maintains a contributory 401 may not first September 30, 2021 2020, .

Note 6- Leases

Note 6- Leases	12 Months Ended
	Sep. 30, 2021
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	NOTE 6 Clearfield leases a 71,000 square foot facility at 7050 ten two January 1, 2015. June 30, 2019, one eighth not not On October 9, 2020, three July 31, 2020. three 12 On February 12, 2020, February 12, 2020. two three In July 2021, March 1 st 2022. two second 2022. not September 30, 2021, not Right-of-use lease assets and lease liabilities are recognized as of the commencement date based on the present value of the remaining lease payments over the lease term which includes renewal periods we are reasonably certain to exercise. Our leases do not Operating lease expense included within cost of sales and selling, general and administrative expense was as follows for the year ended September 30, 2021 2020: Operating lease expense under ASC842 , Leases, Year ended September 30, 2021 Year ended September 30, 2020 Cost of sales $ 999,117 $ 904,638 Selling, general and administrative 217,343 221,507 Total lease expense $ 1,216,460 $ 1,126,145 Our future lease obligations for leases that have commenced were as follows as of September 30, 2021: Operating Leases FY 2022 $ 986,844 FY 2023 943,682 FY 2024 516,725 FY 2025 217,552 FY 2026 - Thereafter - Total lease payments 2,664,803 Less: Interest (134,869 ) Present value of lease liabilities $ 2,529,934 As of September 30, 2021, September 30, 2020, September 30, 2021 2020,

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Revenue [Policy Text Block]	Revenue Recognition:
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents: three September 30, 2021 2020 The Company maintains cash balances at multiple financial institutions, and at times, such balances exceed insured limits. The Company has not not
Investment, Policy [Policy Text Block]	Investments: not five three September 30, 2021 September 30, 2020 Less than one year $ 10,373,831 $ 10,582,527 1-5 years 36,912,777 25,143,000 Total $ 47,286,608 $ 35,725,527
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair Value of Financial Instruments:
Accounts Receivable [Policy Text Block]	Accounts Receivable: not not The allowance for doubtful accounts activity for the years ended September 30, 2021 2020 Year Ended Balance at Beginning of Year Additions (Recoveries) Charged to Costs and Expenses Less Write-offs Balance at End of Year September 30, 2021 $ 289,085 $ (209,612 ) $ - $ 79,473 September 30, 2020 $ 289,085 $ - $ - $ 289,085
Inventory, Policy [Policy Text Block]	Inventories: first first September 30, 2021 September 30, 2020 Raw materials $ 23,071,833 $ 12,287,134 Work-in-process 2,481,890 1,033,021 Finished goods 3,361,576 2,048,514 Inventories, gross 28,915,299 15,368,669 Inventory reserve (1,390,988 ) (960,131 ) Inventories, net $ 27,524,311 $ 14,408,538 On a regular basis, the Company reviews its inventory and identifies that which is excess, slow moving, and obsolete by considering factors such as inventory levels, expected product life, and forecasted sales demand. A reserve is established for any identified excess, slow moving, and obsolete inventory down to its net realizable value through a charge to cost of sales. Inventory write-down charges may not not
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant and Equipment: Estimated useful lives of the assets are as follows: Years Equipment 3 – 7 Leasehold improvements 7-10 or life of lease Vehicles 3 Property, plant and equipment consist of the following: September 30, 2021 September 30, 2020 Manufacturing equipment $ 9,178,935 $ 8,171,497 Office equipment 2,901,385 2,478,056 Leasehold improvements 2,589,777 2,576,861 Vehicles 245,903 245,903 Construction in progress 150,343 19,143 Property, plant and equipment, gross 15,066,343 13,491,460 Less accumulated depreciation 10,068,685 8,538,641 Property, plant and equipment, net $ 4,997,658 $ 4,952,819 Depreciation expense for the years ended September 30, 2021 2020
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill and Intangible Assets: fourth may not September 30, 2021 2020 no September 30, 2021 2020, no A significant reduction in our market capitalization or in the carrying amount of net assets of a reporting unit could result in an impairment charge. If the carrying amount of a reporting unit exceeds its fair value, the Company would measure the possible goodwill impairment loss based on an allocation of the estimate of fair value of the reporting unit to all of the underlying assets and liabilities of the reporting unit, including any previously unrecognized intangible assets. The excess of the fair value of a reporting unit over the amounts assigned to its assets and liabilities is the implied fair value of goodwill. An impairment loss is recognized to the extent that a reporting unit's recorded goodwill exceeds the implied fair value of goodwill. An impairment loss would be based on significant estimates and judgments, and if the facts and circumstances change, a potential impairment could have a material impact on the Company’s financial statements. No impairment of goodwill has occurred during the years ended September 30, 2021 2020, The Company capitalizes legal costs incurred to obtain patents. Once accepted by either the U.S. Patent Office or the equivalent office of a foreign country, these legal costs are amortized using the straight-line method over the remaining estimated lives, not September 30, 2021, In addition, the Company has various finite life intangible assets, most of which were acquired as a result of the acquisition of a portfolio of Telcordia certified outdoor active cabinet products from Calix, Inc. (“Calix”) during fiscal year 2018. September 30, 2021 2020 September 30, 2021 Years Gross Carrying Amount Accumulated Amortization Net Book Value Amount Customer relationships 15 $ 3,742,000 $ 904,317 $ 2,837,683 Certifications 8 1,068,000 483,937 584,063 Trademarks 8 563,000 255,109 307,891 Patents 20 790,384 84,660 705,724 Other 5 31,091 24,873 6,218 Software 1 - 3 1,959,670 1,705,098 254,572 Totals $ 8,154,145 $ 3,457,994 $ 4,696,151 September 30, 2020 Years Gross Carrying Amount Accumulated Amortization Net Book Value Amount Customer relationships 15 $ 3,742,000 $ 654,850 $ 3,087,150 Certifications 8 1,068,000 350,437 717,563 Trademarks 8 563,000 184,734 378,266 Patents 20 689,889 56,257 633,632 Other 5 31,091 18,655 12,436 Software 1 - 3 1,695,559 1,538,390 157,169 Totals $ 7,789,539 $ 2,803,323 $ 4,986,216 Amortization expense related to these assets for the years ended September 30, 2021 2020 Our future estimated amortization expense for intangibles as follows as of September 30, 2021: Estimated amortization expense FY 2022 $ 592,192 FY 2023 531,237 FY 2024 497,387 FY 2025 453,342 FY 2026 325,920 Total $ 2,400,078
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Impairment of Long-Lived Assets: may not not not Any required impairment loss is measured as the amount by which the carrying amount of a long-lived asset or asset group exceeds its fair value and is recorded as a reduction in the carrying value of the related asset or asset group and a charge to operating results. No impairment of long-lived assets occurred during the years ended September 30, 2021 2020,
Income Tax, Policy [Policy Text Block]	Income Taxes: not not In accounting for uncertainty in income taxes, we recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not not 50 September 30, 2021 September 30, 2020, not not 12
Share-based Payment Arrangement [Policy Text Block]	Stock-Based Compensation not The expected terms of the options are based on evaluations of historical and expected future employee exercise behavior. The risk-free interest rate is based on the U.S. Treasury rates at the date of grant with maturity dates approximately equal to the expected life at grant date. Volatility is based on historical and expected future volatility of the Company’s stock. The Company has not not If factors change and we employ different assumptions in the determination of the fair value of grants in future periods, the related compensation expense that we record may
Research and Development Expense, Policy [Policy Text Block]	Research and Development Costs September 30, 2021 2020,
Advertising Cost [Policy Text Block]	Advertising Costs September 30, 2021 2020,
Earnings Per Share, Policy [Policy Text Block]	Net Income Per Share: Weighted average common shares outstanding for the years ended September 30, 2021 2020 Year ended September 30, 2021 2020 Net income $ 20,327,380 $ 7,293,066 Weighted average common shares 13,720,699 13,643,355 Dilutive potential common shares 63,594 - Weighted average dilutive common shares outstanding 13,784,293 13,643,355 Earnings per share: Basic $ 1.48 $ 0.53 Diluted $ 1.47 $ 0.53 There were no September 30, 2021 September 30, 2020,
Use of Estimates, Policy [Policy Text Block]	Use of Estimates: may For the purposes of comparability, certain prior period amounts have been reclassified to conform to current period classification. There was no
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements: In January 2017, 2017 04, Intangibles-Goodwill 2 December 15, 2019. first 2021. 2017 04 first 2021 not In June 2016, 2016 13, Measurement of Credit Losses on Financial Instruments November 2018, 2018 19 2016 13. first 2023, 2016 13

Note 1 - Summary of Significa_2

Note 1 - Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Sep. 30, 2021
Notes Tables
Investments Classified by Contractual Maturity Date [Table Text Block]	September 30, 2021 September 30, 2020 Less than one year $ 10,373,831 $ 10,582,527 1-5 years 36,912,777 25,143,000 Total $ 47,286,608 $ 35,725,527
Financing Receivable, Allowance for Credit Loss [Table Text Block]	Year Ended Balance at Beginning of Year Additions (Recoveries) Charged to Costs and Expenses Less Write-offs Balance at End of Year September 30, 2021 $ 289,085 $ (209,612 ) $ - $ 79,473 September 30, 2020 $ 289,085 $ - $ - $ 289,085
Schedule of Inventory, Current [Table Text Block]	September 30, 2021 September 30, 2020 Raw materials $ 23,071,833 $ 12,287,134 Work-in-process 2,481,890 1,033,021 Finished goods 3,361,576 2,048,514 Inventories, gross 28,915,299 15,368,669 Inventory reserve (1,390,988 ) (960,131 ) Inventories, net $ 27,524,311 $ 14,408,538
Property, Plant and Equipment [Table Text Block]	September 30, 2021 September 30, 2020 Manufacturing equipment $ 9,178,935 $ 8,171,497 Office equipment 2,901,385 2,478,056 Leasehold improvements 2,589,777 2,576,861 Vehicles 245,903 245,903 Construction in progress 150,343 19,143 Property, plant and equipment, gross 15,066,343 13,491,460 Less accumulated depreciation 10,068,685 8,538,641 Property, plant and equipment, net $ 4,997,658 $ 4,952,819
Schedule of Finite-Lived Intangible Assets [Table Text Block]	September 30, 2021 Years Gross Carrying Amount Accumulated Amortization Net Book Value Amount Customer relationships 15 $ 3,742,000 $ 904,317 $ 2,837,683 Certifications 8 1,068,000 483,937 584,063 Trademarks 8 563,000 255,109 307,891 Patents 20 790,384 84,660 705,724 Other 5 31,091 24,873 6,218 Software 1 - 3 1,959,670 1,705,098 254,572 Totals $ 8,154,145 $ 3,457,994 $ 4,696,151 September 30, 2020 Years Gross Carrying Amount Accumulated Amortization Net Book Value Amount Customer relationships 15 $ 3,742,000 $ 654,850 $ 3,087,150 Certifications 8 1,068,000 350,437 717,563 Trademarks 8 563,000 184,734 378,266 Patents 20 689,889 56,257 633,632 Other 5 31,091 18,655 12,436 Software 1 - 3 1,695,559 1,538,390 157,169 Totals $ 7,789,539 $ 2,803,323 $ 4,986,216
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Estimated amortization expense FY 2022 $ 592,192 FY 2023 531,237 FY 2024 497,387 FY 2025 453,342 FY 2026 325,920 Total $ 2,400,078
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Year ended September 30, 2021 2020 Net income $ 20,327,380 $ 7,293,066 Weighted average common shares 13,720,699 13,643,355 Dilutive potential common shares 63,594 - Weighted average dilutive common shares outstanding 13,784,293 13,643,355 Earnings per share: Basic $ 1.48 $ 0.53 Diluted $ 1.47 $ 0.53
Useful Lives [Member]
Notes Tables
Property, Plant and Equipment [Table Text Block]	Years Equipment 3 – 7 Leasehold improvements 7-10 or life of lease Vehicles 3

Note 2 - Shareholders' Equity (

Note 2 - Shareholders' Equity (Tables)	12 Months Ended
	Sep. 30, 2021
Notes Tables
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Year ended September 30, 2021 Year ended September 30, 2020 Dividend yield 0% 0% Weighted average expected volatility 46.9% 39.5 - 44.9% Weighted average risk-free interest rate 0.24% 0.24 - 1.69% Weighted average expected life (years) 5 4 - 6 Vesting period (years) 3 3 - 5
Share-based Payment Arrangement, Option, Activity [Table Text Block]	Number of shares Weighted average exercise price Weighted average fair value Outstanding as of September 30, 2019 290,750 $ 11.86 Granted 121,350 12.43 $ 4.62 Exercised (26,750 ) 4.01 Forfeited and expired (48,250 ) 13.35 Outstanding as of September 30, 2020 337,100 $ 12.48 Granted 105,089 23.74 $ 8.14 Exercised (101,966 ) 12.47 Forfeited and expired (38,709 ) 13.68 Outstanding as of September 30, 2021 301,514 $ 16.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block]	Year ended Exercisable Weighted average remaining contractual life (years) Weighted average exercise price Aggregate intrinsic value September 30, 2021 51,201 2.29 $ 12.28 $ 1,631,575 September 30, 2020 97,333 2.19 $ 12.76 $ 720,826
Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]	Year Ended Number outstanding Weighted average remaining contractual life (years) Weighted average exercise price Aggregate intrinsic value September 30, 2021 301,514 3.22 $ 16.25 $ 8,411,728 September 30, 2020 337,100 3.43 $ 12.48 $ 720,831
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	Number of shares Weighted average grant date fair value Unvested shares as of September 30, 2019 130,440 $ 13.25 Granted 19,455 10.30 Vested (29,950 ) 13.36 Forfeited (10,875 ) 12.14 Unvested shares as of September 30, 2020 109,070 $ 12.98 Granted 39,807 24.20 Vested (35,840 ) 12.48 Forfeited (4,198 ) 15.45 Unvested shares as of September 30, 2021 108,839 $ 17.14

Note 3 - Income Taxes (Tables)

Note 3 - Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2021
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	September 30, September 30, 2021 2020 Current: Federal $ 5,154,287 $ 1,966,491 State 439,944 175,201 Current income tax expense 5,594,231 2,141,692 Deferred: Federal (234,297 ) (252,929 ) State 46,947 (26,879 ) Deferred income tax expense (187,350 ) (279,808 ) Income tax expense $ 5,406,881 $ 1,861,884
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	September 30, September 30, 2021 2020 Federal statutory rate 21.0 % 21.0 % State income taxes 2.2 % 2.0 % Permanent differences: Change in valuation allowance - (0.5% ) Expiration and utilization of state NOL’s - 0.4 % Research and development credits (0.7% ) (2.5% ) Excess tax expense (benefits) from stock-based compensation (1.5% ) (0.1% ) Tax rate 21.0 % 20.3 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	September 30, September 30, 2021 2020 Deferred income tax assets (liabilities): Intangibles $ (91,924 ) $ (86,319 ) Property and equipment depreciation (379,572 ) (419,896 ) Net operating loss carry forwards and credits 300,032 351,446 Stock-based compensation 230,553 169,730 Inventories 518,526 386,296 Prepaid expenses (48,505 ) (43,233 ) Accrued expenses and reserves 519,408 467,010 Goodwill (683,051 ) (646,916 ) Gross deferred tax asset (liability) 365,467 178,118 Valuation allowance - - Net deferred tax asset (liability) $ 365,467 $ 178,118
Summary of Valuation Allowance [Table Text Block]	Year Ended Balance at Beginning of Year Income Tax Benefit Reversal for State NOL Expiration and Utilization Balance at End of Year September 30, 2021 $ - $ - $ - $ - September 30, 2020 $ 47,014 $ (5,235 ) $ (41,779 ) $ -

Note 4 - Concentrations (Tables

Note 4 - Concentrations (Tables)	12 Months Ended
	Sep. 30, 2021
Notes Tables
Disaggregation of Revenue [Table Text Block]	Year Ended September 30, 2021 2020 United States $ 131,285,349 $ 89,021,124 All Other Countries 9,470,050 4,053,390 Total Net Sales $ 140,755,399 $ 93,074,514 Year Ended September 30, 2021 2020 Broadband service providers $ 98 % $ 96 % Legacy customers 2 % 4 % Total Net Sales $ 100 % $ 100 %

Note 6- Leases (Tables)

Note 6- Leases (Tables)	12 Months Ended
	Sep. 30, 2021
Notes Tables
Lessee, Operating Lease Expense [Table Text Block]	Operating lease expense under ASC842 , Leases, Year ended September 30, 2021 Year ended September 30, 2020 Cost of sales $ 999,117 $ 904,638 Selling, general and administrative 217,343 221,507 Total lease expense $ 1,216,460 $ 1,126,145
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Operating Leases FY 2022 $ 986,844 FY 2023 943,682 FY 2024 516,725 FY 2025 217,552 FY 2026 - Thereafter - Total lease payments 2,664,803 Less: Interest (134,869 ) Present value of lease liabilities $ 2,529,934

Note 1 - Summary of Significa_3

Note 1 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Sep. 30, 2021USD ($)shares	Sep. 30, 2020USD ($)shares
Depreciation, Total	$ 1,699,311	$ 1,944,186
Number of Reportable Segments	1
Goodwill, Impairment Loss	$ 0	0
Number of Patents Granted	30
Amortization of Intangible Assets, Total	$ 602,492	477,568
Impairment, Long-Lived Asset, Held-for-Use, Total	0	0
Unrecognized Tax Benefits, Ending Balance	0	0
Research and Development Expense, Total	1,243,499	1,269,542
Advertising Expense	$ 436,253	$ 296,571
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	0	337,100
Patents [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	20 years	20 years
Patents [Member] | Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	20 years

Note 1 - Summary of Significa_4

Note 1 - Summary of Significant Accounting Policies - Maturity Date of CDs (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Less than one year	$ 10,373,831	$ 10,582,527
1-5 years	36,912,777	25,143,000
Total	$ 47,286,608	$ 35,725,527

Note 1 - Summary of Significa_5

Note 1 - Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Balance at Beginning of Year	$ 289,085	$ 289,085
Additions Charged to Costs and Expenses	(209,612)	0
Less Write-offs	0	0
Balance at End of Year	$ 79,473	$ 289,085

Note 1 - Summary of Significa_6

Note 1 - Summary of Significant Accounting Policies - Components of Inventory (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Raw materials	$ 23,071,833	$ 12,287,134
Work-in-process	2,481,890	1,033,021
Finished goods	3,361,576	2,048,514
Inventories, gross	28,915,299	15,368,669
Inventory reserve	(1,390,988)	(960,131)
Inventories, net	$ 27,524,311	$ 14,408,538

Note 1 - Summary of Significa_7

Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Details)	12 Months Ended
	Sep. 30, 2021
Equipment [Member] | Minimum [Member]
Property, plant and equipment useful life (Year)	3 years
Equipment [Member] | Maximum [Member]
Property, plant and equipment useful life (Year)	7 years
Vehicles [Member]
Property, plant and equipment useful life (Year)	3 years

Note 1 - Summary of Significa_8

Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Fixed Assets	$ 15,066,343	$ 13,491,460
Less accumulated depreciation	10,068,685	8,538,641
Property, plant and equipment, net	4,997,658	4,952,819
Machinery and Equipment [Member]
Fixed Assets	9,178,935	8,171,497
Office Equipment [Member]
Fixed Assets	2,901,385	2,478,056
Leasehold Improvements [Member]
Fixed Assets	2,589,777	2,576,861
Vehicles [Member]
Fixed Assets	245,903	245,903
Construction in Progress [Member]
Fixed Assets	$ 150,343	$ 19,143

Note 1 - Summary of Significa_9

Note 1 - Summary of Significant Accounting Policies - Finite Lived Intangible Assets (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Gross carrying amount	$ 8,154,145	$ 7,789,539
Accumulated amortization	3,457,994	2,803,323
Net book value amount	$ 4,696,151	$ 4,986,216
Customer Relationships [Member]
Useful life (Year)	15 years	15 years
Gross carrying amount	$ 3,742,000	$ 3,742,000
Accumulated amortization	904,317	654,850
Net book value amount	$ 2,837,683	$ 3,087,150
Certification Marks [Member]
Useful life (Year)	8 years	8 years
Gross carrying amount	$ 1,068,000	$ 1,068,000
Accumulated amortization	483,937	350,437
Net book value amount	$ 584,063	$ 717,563
Trademarks [Member]
Useful life (Year)	8 years	8 years
Gross carrying amount	$ 563,000	$ 563,000
Accumulated amortization	255,109	184,734
Net book value amount	$ 307,891	$ 378,266
Patents [Member]
Useful life (Year)	20 years	20 years
Gross carrying amount	$ 790,384	$ 689,889
Accumulated amortization	84,660	56,257
Net book value amount	$ 705,724	$ 633,632
Patents [Member] | Maximum [Member]
Useful life (Year)	20 years
Other Intangible Assets [Member]
Useful life (Year)	5 years	5 years
Gross carrying amount	$ 31,091	$ 31,091
Accumulated amortization	24,873	18,655
Net book value amount	6,218	12,436
Computer Software, Intangible Asset [Member]
Gross carrying amount	1,959,670	1,695,559
Accumulated amortization	1,705,098	1,538,390
Net book value amount	$ 254,572	$ 157,169
Computer Software, Intangible Asset [Member] | Minimum [Member]
Useful life (Year)	1 year	1 year
Computer Software, Intangible Asset [Member] | Maximum [Member]
Useful life (Year)	3 years	3 years

Note 1 - Summary of Signific_10

Note 1 - Summary of Significant Accounting Policies - Future Estimated Amortization Expense for Intangibles (Details)	Sep. 30, 2021USD ($)
FY 2022	$ 592,192
FY 2023	531,237
FY 2024	497,387
FY 2025	453,342
FY 2026	325,920
Total	$ 2,400,078

Note 1 - Summary of Signific_11

Note 1 - Summary of Significant Accounting Policies - Weighted Average Common Shares Outstanding (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Net income	$ 20,327,380	$ 7,293,066
Weighted average common shares (in shares)	13,720,699	13,643,355
Dilutive potential common shares (in shares)	63,594	0
Weighted average dilutive common shares outstanding (in shares)	13,784,293	13,643,355
Earnings per share:
Basic (in dollars per share)	$ 1.48	$ 0.53
Diluted (in dollars per share)	$ 1.47	$ 0.53

Note 2 - Shareholders' Equity_2

Note 2 - Shareholders' Equity (Details Textual) - USD ($)	Apr. 25, 2017	Feb. 29, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Nov. 13, 2014
Stock Repurchase Program, Remaining Authorized Repurchase Amount							$ 4,980,671		$ 8,000,000
Stock Repurchase Program, Increase in Authorized Amount	$ 4,000,000
Stock Repurchase Program, Authorized Amount	$ 12,000,000
Common Stock, Shares Authorized (in shares)							50,000,000	50,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)							$ 0.01	$ 0.01
Preferred Stock, Shares Authorized (in shares)							500,000	500,000
Preferred Stock, Shares Issued, Total (in shares)							0	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)							667,465
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total							$ 2,529,274
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)							3 years 1 month 6 days
Share-based Payment Arrangement, Expense							$ 1,280,135	$ 773,555
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)							105,089	121,350
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)							5 years	5 years 8 months 15 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)							3 years	4 years 8 months 15 days
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)							$ 23.74	$ 12.43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)							79,833	44,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)							101,966	26,750
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value							$ 1,314,900	$ 332,468
Stock Repurchased During Period, Shares (in shares)							11,754	10,038
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)							$ 39.32	$ 17.57
Payment, Tax Withholding, Share-based Payment Arrangement							$ 462,115	$ 176,416
Preferred Stock, Shares Outstanding, Ending Balance (in shares)							0	0
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)							194,873
Share-based Compensation Arrangement by Share-based Payment Award, Market Price Percentage, Offering Date							85.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)			9,739	15,011	15,116	15,107
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price (in dollars per share)			$ 21.01	$ 11.93	$ 11.85	$ 11.23
Payment, Tax Withholding, Share-based Payment Arrangement							$ 143,768
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)		200,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)								3 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)								5 years
Share-based Payment Arrangement, Option [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)							3 years
Share-based Payment Arrangement, Option [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)							6 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)							5 years
Cashless Method Stock Option Exercised [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)							101,966	14,688
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value							$ 1,364,007	$ 496,829
Restricted Stock [Member] | Minimum [Member] | Employees [Member] | Stock Compensation Plan 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)							1 year
Restricted Stock [Member] | Maximum [Member] | Employees [Member] | Stock Compensation Plan 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)							10 years
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense							$ 1,222,756	752,011
Cost of Sales [Member]
Share-based Payment Arrangement, Expense							$ 57,379	$ 21,544
Undesignated Shares [Member]
Preferred Stock, Shares Authorized (in shares)							5,000,000
Series B Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)							500,000
Preferred Stock, Shares Issued, Total (in shares)							0
Preferred Stock, Shares Outstanding, Ending Balance (in shares)							0

Note 2 - Shareholders' Equity -

Note 2 - Shareholders' Equity - Valuation Assumptions (Details)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Dividend yield	0.00%	0.00%
Weighted average expected volatility	46.90%
Weighted average risk-free interest rate	0.24%
Weighted average expected life (years) (Year)	5 years
Vesting period (Year)	3 years	4 years 8 months 15 days
Minimum [Member]
Weighted average expected volatility		39.50%
Weighted average risk-free interest rate		0.24%
Weighted average expected life (years) (Year)		4 years
Vesting period (Year)		3 years
Maximum [Member]
Weighted average expected volatility		44.90%
Weighted average risk-free interest rate		1.69%
Weighted average expected life (years) (Year)		6 years
Vesting period (Year)		5 years

Note 2 - Shareholders' Equity_3

Note 2 - Shareholders' Equity - Option Transaction Summary (Details) - $ / shares	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Options, outstanding (in shares)	337,100	290,750
Weighted-average exercise price, outstanding (in dollars per share)	$ 12.48	$ 11.86
Granted (in shares)	105,089	121,350
Weighted-average exercise price, Granted (in dollars per share)	$ 23.74	$ 12.43
Weighted-average fair value, Granted (in dollars per share)	$ 8.14	$ 4.62
Exercised (in shares)	(101,966)	(26,750)
Weighted-average exercise price, Exercised (in dollars per share)	$ 12.47	$ 4.01
Forfeited and expired (in shares)	(38,709)	(48,250)
Weighted-average exercise price, Forfeited or Expired (in dollars per share)	$ 13.68	$ 13.35
Options, outstanding (in shares)	301,514	337,100
Weighted-average exercise price, outstanding (in dollars per share)	$ 16.25	$ 12.48

Note 2 - Shareholders' Equity_4

Note 2 - Shareholders' Equity - Options Exercisable (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Exercisable (in shares)	51,201	97,333
Weighted average remaining contractual life (Year)	2 years 3 months 14 days	2 years 2 months 8 days
Weighted average exercise price (in dollars per share)	$ 12.28	$ 12.76
Aggregate intrinsic value	$ 1,631,575	$ 720,826

Note 2 - Shareholders' Equity_5

Note 2 - Shareholders' Equity - Options Currently Outstanding (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Number outstanding (in shares)	301,514	337,100	290,750
Weighted average remaining contractual life (Year)	3 years 2 months 19 days	3 years 5 months 4 days
Weighted average exercise price (in dollars per share)	$ 16.25	$ 12.48	$ 11.86
Aggregate intrinsic value	$ 8,411,728	$ 720,831

Note 2 - Shareholders' Equity_6

Note 2 - Shareholders' Equity - Restricted Stock Transactions (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Balance, unvested shares (in shares)	109,070	130,440
Balance, weighted-average grant date fair value (in dollars per share)	$ 12.98	$ 13.25
Granted (in shares)	39,807	19,455
Granted, weighted-average grant date fair value (in dollars per share)	$ 24.20	$ 10.30
Vested (in shares)	(35,840)	(29,950)
Vested, weighted-average grant date fair value (in dollars per share)	$ 12.48	$ 13.36
Forfeited (in shares)	(4,198)	(10,875)
Forfeited, weighted-average grant date fair value (in dollars per share)	$ 15.45	$ 12.14
Balance, unvested shares (in shares)	108,839	109,070
Balance, weighted-average grant date fair value (in dollars per share)	$ 17.14	$ 12.98

Note 3 - Income Taxes (Details

Note 3 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Accrued Income Taxes, Current	$ 933,000	$ 845,000
Deferred Tax Assets, Valuation Allowance, Total	0	0	$ 47,014
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 0	0
Open Tax Year	2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2017 2018 2019
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 0	769,000
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	$ 300,033	337,000
State and Local Jurisdiction [Member] | Alternative Minimum Tax [Member]
Tax Credit Carryforward, Amount		32,000
State and Local Jurisdiction [Member] | Research and Development and Alternative Minimum Tax Credit Carryforwards [Member]
Deferred Tax Assets, Valuation Allowance, Total		$ 0

Note 3 - Income Taxes - Income

Note 3 - Income Taxes - Income Tax Expense (Benefit) Components (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Federal	$ 5,154,287	$ 1,966,491
State	439,944	175,201
Current income tax expense	5,594,231	2,141,692
Federal	(234,297)	(252,929)
State	46,947	(26,879)
Deferred income tax expense	(187,350)	(279,808)
Income tax expense	$ 5,406,881	$ 1,861,884

Note 3 - Income Taxes - Reconci

Note 3 - Income Taxes - Reconciliation of the Federal Statutory Income Tax Rate (Details)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Federal statutory rate	21.00%	21.00%
State income taxes	2.20%	2.00%
Change in valuation allowance	0.00%	(0.50%)
Expiration and utilization of state NOL’s	0.00%	0.40%
Research and development credits	(0.70%)	(2.50%)
Excess tax expense (benefits) from stock-based compensation	1.50%	0.10%
Tax rate	21.00%	20.30%

Note 3 - Income Taxes - Signifi

Note 3 - Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Intangibles	$ (91,924)	$ (86,319)
Property and equipment depreciation	(379,572)	(419,896)
Net operating loss carry forwards and credits	300,032	351,446
Stock-based compensation	230,553	169,730
Inventories	518,526	386,296
Prepaid expenses	(48,505)	(43,233)
Accrued expenses and reserves	519,408	467,010
Goodwill	(683,051)	(646,916)
Gross deferred tax asset (liability)	365,467	178,118
Valuation allowance	0	0	$ (47,014)
Net deferred tax asset (liability)	$ 365,467	$ 178,118

Note 3 - Income Taxes - Valuati

Note 3 - Income Taxes - Valuation Allowance Activity (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Balance at Beginning of Year	$ 0	$ 47,014
Income Tax Benefit	0	(5,235)
Reversal for State NOL Expiration and Utilization	0	(41,779)
Balance at End of Year	$ 0	$ 0

Note 4 - Concentrations (Detail

Note 4 - Concentrations (Details Textual)	12 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)
Property, Plant and Equipment, Net, Ending Balance	$ 4,997,658	$ 4,952,819
MEXICO
Property, Plant and Equipment, Net, Ending Balance	$ 1,768,837	$ 1,686,209
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers	2	2
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Concentration Risk, Percentage	28.00%	30.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers	1	2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customers [Member]
Concentration Risk, Percentage		25.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage	17.00%

Note 4 - Concentrations - Disag

Note 4 - Concentrations - Disaggregation of Revenue (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Total Net Sales	$ 140,755,399	$ 93,074,514
Percent of net sales	100.00%	100.00%
Broadband Service Providers [Member]
Percent of net sales	98.00%	96.00%
Legacy Customers [Member]
Percent of net sales	2.00%	4.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | UNITED STATES
Total Net Sales	$ 131,285,349	$ 89,021,124
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Non-US [Member]
Total Net Sales	$ 9,470,050	$ 4,053,390

Note 5 - Employee Benefit Plan

Note 5 - Employee Benefit Plan (Details Textual) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 914,942	$ 838,946
First Level of Matching [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Second Level Of Matching [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%

Note 6- Leases (Details Textual

Note 6- Leases (Details Textual)	Jul. 31, 2021USD ($)ft²a	Sep. 30, 2021USD ($)ft²	Sep. 30, 2020USD ($)	Mar. 01, 2022USD ($)	Feb. 12, 2020ft²	Jun. 30, 2019ft²	Jan. 01, 2015
Operating Lease, Right-of-Use Asset		$ 2,305,413	$ 2,539,100
Operating Lease, Weighted Average Remaining Lease Term (Year)		3 years 1 month 2 days	3 years 11 months 26 days
Operating Lease, Weighted Average Discount Rate, Percent		3.41%	3.48%
Operating Lease, Payments		$ 1,289,982	$ 812,107
Operating Lease, Liability, Total		$ 2,529,934
7050 Winnetka Avenue North, Brooklyn Park, Minnesota [Member]
Area of Real Estate Property (Square Foot) | ft²		71,000				14,000
Lessee, Operating Lease, Term of Contract (Year)							10 years 2 months 1 day
Operating Lease Termination Fee		$ 249,000
Tijuana, Mexico [Member]
Area of Real Estate Property (Square Foot) | ft²	46,000
Lessee, Operating Lease, Term of Contract (Year)	3 years
Tijuana, Mexico 2 [Member]
Area of Real Estate Property (Square Foot) | ft²					52,000
Lessee, Operating Lease, Term of Contract (Year)					42 months
Lessee, Operating Lease, Number of Options to Renew					2
Lessee, Operating Lease, Renewal Term (Year)					3 years
Tijuana, Mexico 3 [Member]
Area of Real Estate Property (Square Foot) | a	318,000
Lessee, Operating Lease, Number of Options to Renew	2
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Year)	7 years
Lessee, Operating Lease, Lease Not yet Commenced, Renewal Term (Year)	5 years
Operating Lease, Monthly Payment	$ 162,232
Operating Lease, Payments, Increase, Percentage	2.00%
Tijuana, Mexico 3 [Member] | Forecast [Member]
Operating Lease, Right-of-Use Asset				$ 9,432,000
Operating Lease, Liability, Total				$ 9,432,000
Tijuana, Mexico 3 [Member] | Lease Mandatory Contractual Term [Member]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Year)	5 years

Note 6 - Leases - Operating Lea

Note 6 - Leases - Operating Lease Expense (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Total lease expense under ASC 842	$ 1,216,460	$ 1,126,145
Cost of Sales [Member]
Total lease expense under ASC 842	999,117	904,638
Selling, General and Administrative Expenses [Member]
Total lease expense under ASC 842	$ 217,343	$ 221,507

Note 6 - Leases - Maturities of

Note 6 - Leases - Maturities of Lease Liabilities (Details)	Sep. 30, 2021USD ($)
FY 2022	$ 986,844
FY 2023	943,682
FY 2024	516,725
FY 2025	217,552
FY 2026	0
Thereafter	0
Total lease payments	2,664,803
Less: Interest	(134,869)
Present value of lease liabilities	$ 2,529,934