NVE (NVEC) 10-K 4 May 22 2022 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2022	Apr. 29, 2022	Sep. 30, 2021
Document Information [Line Items]
Entity Central Index Key	0000724910
Entity Registrant Name	NVE CORP /NEW/
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
Document Type	10-K
Document Annual Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	000-12196
Entity Incorporation, State or Country Code	MN
Entity Tax Identification Number	41-1424202
Entity Address, Address Line One	11409 Valley View Road
Entity Address, City or Town	Eden Prairie
Entity Address, State or Province	MN
Entity Address, Postal Zip Code	55344
City Area Code	952
Local Phone Number	829-9217
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	NVEC
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			$ 200,000,000
Entity Common Stock, Shares Outstanding		4,830,826
Auditor Name	Boulay PLLP
Auditor Location	Minneapolis, Minnesota
Auditor Firm ID	542

Balance Sheets

Balance Sheets - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Current assets
Cash and cash equivalents	$ 10,449,510	$ 10,427,340
Marketable securities, short-term	20,839,683	7,678,957
Accounts receivable, net of allowance for uncollectible accounts of $15,000	4,704,829	1,964,281
Inventories	5,088,635	3,900,777
Prepaid expenses and other assets	420,520	391,278
Total current assets	41,503,177	24,362,633
Fixed assets
Machinery and equipment	9,739,244	9,254,664
Leasehold improvements	1,810,872	1,810,872
Property, Plant and Equipment, Gross, Ending Balance	11,550,116	11,065,536
Less accumulated depreciation and amortization	10,943,731	10,728,853
Net fixed assets	606,385	336,683
Deferred tax assets	483,469	73,538
Marketable securities, long-term	24,314,211	47,038,669
Right-of-use asset – operating lease	560,250	689,216
Total assets	67,467,492	72,500,739
Current liabilities
Accounts payable	943,535	336,591
Accrued payroll and other	1,356,689	540,474
Operating lease	156,121	150,273
Total current liabilities	2,456,345	1,027,338
Operating lease	446,018	581,459
Total liabilities	2,902,363	1,608,797
Shareholders’ equity
Common stock, $0.01 par value, 6,000,000 shares authorized; 4,830,826 issued and outstanding as of March 31, 2022 and 4,833,232 as of March 31, 2021	48,308	48,332
Additional paid-in capital	19,256,485	19,338,127
Accumulated other comprehensive income (loss)	(318,120)	1,101,119
Retained earnings	45,578,456	50,404,364
Total shareholders’ equity	64,565,129	70,891,942
Total liabilities and shareholders’ equity	$ 67,467,492	$ 72,500,739

Balance Sheets (Parentheticals)

Balance Sheets (Parentheticals) - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Allowance for uncollectible accounts	$ 15,000	$ 15,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	6,000,000	6,000,000
Common stock, shares issued (in shares)	4,830,826	4,833,232
Common stock, shares outstanding (in shares)	4,830,826	4,833,232

Statements of Income

Statements of Income - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue
Revenue	$ 26,986,970	$ 21,366,246
Cost of sales	6,263,090	4,121,461
Gross profit	20,723,880	17,244,785
Expenses
Research and development	2,925,874	3,184,754
Selling, general, and administrative	1,469,321	1,316,427
Total expenses	4,395,195	4,501,181
Income from operations	16,328,685	12,743,604
Interest income	1,171,128	1,498,148
Income before taxes	17,499,813	14,241,752
Provision for income taxes	2,992,312	2,547,368
Net income	$ 14,507,501	$ 11,694,384
Net income per share – basic (in dollars per share)	$ 3	$ 2.42
Net income per share – diluted (in dollars per share)	3	2.42
Cash dividends declared per common share (in dollars per share)	$ 4	$ 4
Weighted average shares outstanding
Basic (in shares)	4,833,661	4,834,054
Diluted (in shares)	4,835,639	4,834,462
Product [Member]
Revenue
Revenue	$ 25,867,649	$ 20,540,557
Contract Research and Development [Member]
Revenue
Revenue	$ 1,119,321	$ 825,689

Statements of Comprehensive Inc

Statements of Comprehensive Income - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net income	$ 14,507,501	$ 11,694,384
Unrealized gain (loss) from marketable securities, net of tax	(1,419,239)	584,596
Comprehensive income	$ 13,088,262	$ 12,278,980

Statements of Shareholders' Equ

Statements of Shareholders' Equity - USD ($)	Cumulative Effect, Period of Adoption, Adjustment [Member]Common Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Mar. 31, 2020		4,835,038
Balance at Mar. 31, 2020		$ 48,350	$ 19,383,956	$ 516,523	$ 58,046,520	$ 77,995,349
Repurchase of common stock (in shares)		(1,806)
Repurchase of common stock		$ (18)	(91,401)			(91,419)
Unrealized gain (loss) from marketable securities, net of tax				584,596		584,596
Net income					11,694,384	11,694,384
Total comprehensive income						12,278,980
Stock-based compensation			45,572			45,572
Cash dividends declared ($4.00 per share of common stock)					(19,336,540)	(19,336,540)
Balance (in shares) at Mar. 31, 2021	4,833,232
Balance at Mar. 31, 2021		$ 48,332	19,338,127	1,101,119	50,404,364	70,891,942
Repurchase of common stock (in shares)		(2,888)
Repurchase of common stock		$ (29)	(163,492)			(163,521)
Unrealized gain (loss) from marketable securities, net of tax				(1,419,239)		(1,419,239)
Net income					14,507,501	14,507,501
Total comprehensive income						13,088,262
Stock-based compensation			81,855			81,855
Cash dividends declared ($4.00 per share of common stock)					(19,333,409)	(19,333,409)
Exercise of stock options (in shares)		482
Exercise of stock options		$ 5	(5)
Balance (in shares) at Mar. 31, 2022		4,830,826
Balance at Mar. 31, 2022		$ 48,308	$ 19,256,485	$ (318,120)	$ 45,578,456	$ 64,565,129

Statements of Shareholders' E_2

Statements of Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Common stock per share (in dollars per share)	$ 4	$ 4

Statements of Cash Flows

Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
OPERATING ACTIVITIES
Net income	$ 14,507,501	$ 11,694,384
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	424,981	542,926
Stock-based compensation	81,855	45,572
Deferred income taxes	24,457	(129,155)
Changes in operating assets and liabilities:
Accounts receivable	(2,740,548)	729,737
Inventories	(1,187,858)	(16,327)
Prepaid expenses and other assets	99,724	391,699
Accounts payable and accrued expenses	1,293,567	105,996
Net cash provided by operating activities	12,503,679	13,364,832
INVESTING ACTIVITIES
Purchases of fixed assets	(484,579)	(62,727)
Purchases of marketable securities	0	(10,512,400)
Proceeds from maturities and sales of marketable securities	7,500,000	19,000,000
Net cash provided by investing activities	7,015,421	8,424,873
FINANCING ACTIVITIES
Repurchase of common stock	(163,521)	(91,419)
Payment of dividends to shareholders	(19,333,409)	(19,336,540)
Net cash used in financing activities	(19,496,930)	(19,427,959)
Increase in cash and cash equivalents	22,170	2,361,746
Cash and cash equivalents at beginning of year	10,427,340	8,065,594
Cash and cash equivalents at end of year	10,449,510	10,427,340
Supplemental disclosures of cash flow information:
Cash paid during the year for income taxes	$ 2,520,000	$ 2,438,788

Note 1 - Description of Busines

Note 1 - Description of Business	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Business Description and Basis of Presentation [Text Block]	NOTE 1. We develop and sell devices that use spintronics, a nanotechnology that relies on electron spin rather than electron charge to acquire, store, and transmit information. We operate in one reportable segment.

Note 2 - Summary of Significant

Note 2 - Summary of Significant Accounting Policies	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Basis of Presentation and Significant Accounting Policies [Text Block]	NOTE 2. Cash and Cash Equivalents We consider all highly liquid investments with maturities of three Fair Value of Financial Instruments The carrying amount of cash and cash equivalents, accounts receivable, and accounts payable approximates fair value because of the short maturity of these instruments. Fair values of marketable securities are based on quoted market prices. Concentration of Risk and Financial Instruments Financial instruments potentially subject to significant concentrations of credit risk consist principally of cash equivalents, marketable securities, and accounts receivable. Cash and cash equivalents have been maintained in financial institutions we believe have high credit quality, however these accounts are generally in excess of federally insured amounts. We have invested our excess cash in corporate-backed and municipal-backed bonds and money market instruments. Our investment policy prescribes purchases of only high-grade securities, and limits the amount of credit exposure to any one Our customers are throughout the world. We generally do not Additionally, we are dependent on critical suppliers including our packaging vendors and suppliers of certain raw silicon and semiconductor wafers that are incorporated in our products. The effects of the COVID- 19 Accounts Receivable and Allowance for Doubtful Accounts We grant credit to customers in the normal course of business and at times may 2022 2021. Inventories Inventories are stated at the lower of cost or net realizable value. Cost is determined by the first first Product Warranty In general we warranty our products to be free from defects in material and workmanship for one Fixed Assets Fixed assets are stated at cost. Depreciation of machinery and equipment is recorded over the estimated useful lives of the assets, generally five five not 2022 2021. 2022 2021. Revenue Recognition We recognize revenue when we satisfy performance obligations by the transfer of control of products or services to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those products or services. Revenue is disaggregated into product sales and contract research and development to depict the nature, amount, timing of revenue recognition and economic characteristics of our business, and is represented within the financial statements. We recognize revenue from product sales to customers and distributors when we satisfy our performance obligation, at a point in time, on product shipment or delivery to our customer or distributor as determined by agreed on shipping terms. Shipping charges billed to customers are included in product sales and the related shipping costs are included in cost of sales. Under certain limited circumstances, our distributors may third We recognize contract research and development revenue over a period of time as the performance obligation is satisfied over a period of time rather than a point in time. Contracts have specifications unique to each customer and do not Accounts receivable is recognized when we have transferred a good or service to a customer and our right to receive consideration is unconditional through the completion of our performance obligation. A contract asset is recognized when we have a right to consideration from the transfer of goods or services to a customer but have not not no March 31, 2022 March 31, 2021. Our performance obligations related to product sales and contract research and development contracts are satisfied in one one 606, Revenue from Contracts with Customers not not one Income Taxes We account for income taxes using the asset and liability method. Deferred income taxes are provided for temporary differences between the financial reporting and tax bases of assets and liabilities. We provide valuation allowances against deferred tax assets if we determine that it is less likely than not Research and Development Expense Recognition Research and development costs are expensed as they are incurred. Customer-sponsored research and development costs are included in cost of sales. Stock-Based Compensation We measure stock-based compensation cost at the grant date based on the fair value of the award and recognize the compensation expense over the requisite service period, which is generally the vesting period. We recognize any forfeitures as they occur. Net Income Per Share Net income per basic share is computed based on the weighted-average number of common shares issued and outstanding during each year. Net income per diluted share amounts assume exercise of all stock options. The following table shows the components of diluted shares: Year Ended March 31 2022 2021 Weighted average common shares outstanding – basic 4,833,661 4,834,054 Dilutive effect of stock options 1,978 408 Shares used in computing net income per share – diluted 4,835,639 4,834,462 Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires us to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Recently Issued Accounting Standards Recently Adopted Accounting Standard In December 2019, No. 2019 12, 740 2019 12 740, 2019 12 June 30, 2021. no New Accounting Standard Not In May 2021, No. 2021 04, 260 470 50 718 815 40 2021 04 2021 04 December 15, 2021 2023 not

Note 3 - Fair Value of Financia

Note 3 - Fair Value of Financial Instruments	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Fair Value Disclosures [Text Block]	NOTE 3. Our corporate bonds and money market funds are classified as available-for-sale securities and carried at estimated fair value. Unrealized holding gains and losses are included in accumulated other comprehensive income in the statement of shareholders’ equity. Corporate bonds with remaining maturities less than one one three The fair value of our available-for-sale securities as of March 31, 2022 Total <1 Year 1 3 Years 3 5 Years $ 51,910,887 $ 27,596,676 $ 24,314,211 $ - Total available-for-sale securities represented approximately 67% of our total assets. Marketable securities as of March 31, 2022 Generally accepted accounting principles establish a framework for measuring fair value, provide a definition of fair value, and prescribe required disclosures about fair-value measurements. Generally accepted accounting principles define fair value as the price that would be received to sell an asset or paid to transfer a liability. Fair value is a market-based measurement that should be determined using assumptions that market participants would use in pricing an asset or liability. Generally accepted accounting principles utilize a valuation hierarchy for disclosure of fair value measurements. The categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The categories within the valuation hierarchy are described as follows: Level 1 Level 2 2 Level 3 Money market funds are included on the balance sheets in “Cash and cash equivalents.” Corporate bonds are included on the balance sheets in “Marketable securities, short term” and “Marketable securities, long term.” The following table shows the estimated fair value of assets that were accounted for at fair value on a recurring basis: As of March 31, 2022 As of March 31, 2021 Level 1 Level 2 Total Level 1 Level 2 Total Money market funds $ 6,756,993 $ - $ 6,756,993 $ 10,143,196 $ - $ 10,143,196 Corporate bonds - 45,153,894 45,153,894 - 54,717,626 54,717,626 Total $ 6,756,993 $ 45,153,894 $ 51,910,887 $ 10,143,196 $ 54,717,626 $ 64,860,822 Our available-for-sale securities as of March 31, 2022 2021, As of March 31, 2022 As of March 31, 2021 Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Estimated Fair Value Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Estimated Fair Value Money market funds $ 6,756,993 $ - $ - $ 6,756,993 $ 10,143,196 $ - $ - $ 10,143,196 Corporate bonds 45,561,114 230,085 (637,305 ) 45,153,894 53,308,105 1,570,195 (160,674 ) 54,717,626 Total $ 52,318,107 $ 230,085 $ (637,305 ) $ 51,910,887 $ 63,451,301 $ 1,570,195 $ (160,674 ) $ 64,860,822 The following table shows the gross unrealized holding losses and fair value of our available-for-sale securities with unrealized holding losses, aggregated by class of securities and length of time that individual securities had been in a continuous unrealized loss position as of March 31, 2022 2021. Less Than 12 Months 12 Months or Greater Total Estimated Fair Value Gross Unrealized Holding Losses Estimated Fair Value Gross Unrealized Holding Losses Estimated Fair Value Gross Unrealized Holding Losses As of March 31, 2022 Corporate bonds $ 6,306,750 $ (23,727 ) $ 9,738,338 $ (613,578 ) $ 16,045,088 $ (637,305 ) Total $ 6,306,750 $ (23,727 ) $ 9,738,338 $ (613,578 ) $ 16,045,088 $ (637,305 ) As of March 31, 2021 Corporate bonds $ 10,322,539 $ (160,674 ) $ - $ - $ 10,322,539 $ (160,674 ) Total $ 10,322,539 $ (160,674 ) $ - $ - $ 10,322,539 $ (160,674 ) We did not March 31, 2022. not not not not March 31, 2022.

Note 4 - Inventories

Note 4 - Inventories	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Inventory Disclosure [Text Block]	NOTE 4. Inventories are shown in the following table: March 31 2022 2021 Raw materials $ 987,062 $ 660,678 Work in process 3,355,838 2,220,723 Finished goods 745,735 1,019,376 Total inventories $ 5,088,635 $ 3,900,777

Note 5 - Stock-based Compensati

Note 5 - Stock-based Compensation	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Share-Based Payment Arrangement [Text Block]	NOTE 5. Stock Option Plan Our 2000 may five one ten not not 2022 2021. Valuation assumptions We use the Black-Scholes standard option-pricing model to determine the fair value of stock options. The following assumptions were used to estimate the fair value of options granted: Year Ended March 31 2022 2021 Risk-free interest rate 0.7 – 0.9% 0.2 – 0.4% Expected volatility 35 – 36% 34 – 35% Expected life (years) 4.6 4.6 Dividend yield 5.0 – 5.4% 7.0 – 7.4% The determination of the fair value of the awards on the date of grant using the Black-Scholes model is affected by our stock price as well as assumptions of other variables, including projected stock option exercise behaviors, risk-free interest rate, and expected volatility of our stock price in future periods. Our estimates and assumptions affect the amounts reported in the financial statements and accompanying notes. Expected life We analyze historical exercise and termination data to estimate the expected life assumption. We believe historical data currently represents the best estimate of the expected life of a new option. Risk-free interest rate The risk-free rate is based on the yield of U.S. Treasury securities on the grant date for maturities similar to the expected lives of the options. Volatility We use historical volatility to estimate the expected volatility of our common stock. Dividend yield We assumed a 5.0% to 5.4% dividend yield for fiscal 2022 2021 Tax effects of stock-based compensation Stock-based compensation increased deferred tax assets by $13,521 for fiscal 2022 2021. General stock option information The following table summarizes information on options outstanding as of March 31, 2022: Ranges of Exercise Prices Number Outstanding Weighted Average Exercise Price Weighted Remaining Contractual Life (years) $49.86 – $57.46 17,500 $ 55.94 4.0 $67.65 – $107.86 11,500 78.44 5.7 29,000 $ 69.52 5.0 A summary of our stock options is shown in the following table: Option Shares Reserved Options Outstanding Weighted Average Option Exercise Price At March 31, 2019 135,230 22,000 $ 70.89 Granted (4,000 ) 4,000 $ 67.65 Exercised - (2,000 ) $ 56.18 At March 31, 2020 131,230 24,000 $ 71.58 Granted (6,500 ) 6,500 $ 56.12 At March 31, 2021 124,730 30,500 $ 68.28 Granted (6,500 ) 6,500 $ 74.22 Exercised 5,000 (5,000 ) $ 61.36 Terminated 3,000 (3,000 ) $ 80.75 At March 31, 2022 126,230 29,000 $ 69.52 The remaining weighted-average exercisable life was 5.0 years as of March 31, 2022 March 31, 2021. March 31, 2022 March 31, 2021. March 31, 2022 2022. March 31, 2022 first 2023.

Note 6 - Income Taxes

Note 6 - Income Taxes	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 6. Income tax provisions for fiscal 2022 2021 Year Ended March 31 2022 2021 Current taxes Federal $ 2,863,915 $ 2,600,670 State 140,822 75,852 Deferred taxes Federal (11,927 ) (123,959 ) State (499 ) (5,195 ) Income tax provision $ 2,992,312 $ 2,547,368 A reconciliation of income tax provisions at the U.S. statutory rate for fiscal 2022 2021 Year Ended March 31 2022 2021 Tax expense at U.S. Statutory rate $ 3,674,961 $ 2,990,768 State income taxes, net of Federal benefit 136,144 88,909 Research and development credits (42,688 ) (86,223 ) Foreign-derived intangible income deduction (662,467 ) (450,912 ) Other (113,638 ) 4,826 Income tax provision $ 2,992,312 $ 2,547,368 Deferred income taxes reflect the net tax effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax assets and liabilities as of March 31, 2022 2021 March 31 2022 2021 Paid time off accrual $ 63,055 $ 60,869 Inventory reserve 47,042 50,324 Depreciation and amortization 88,690 88,690 Stock-based compensation deductions 88,710 75,189 Unrealized gain on marketable securities 89,102 (308,403 ) Other 106,870 106,869 Deferred tax assets $ 483,469 $ 73,538 We had no unrecognized tax benefits as of March 31, 2022, not 12 March 31, 2022 2018 2020

Note 7 - Leases

Note 7 - Leases	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	NOTE 7. We conduct our operations in a leased facility under a non-cancellable lease expiring March 31, 2026. not Year Ended March 31 2022 2021 Operating lease cost $ 170,062 $ 158,439 Variable lease cost 120,606 109,449 Total $ 290,668 $ 267,888 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for leases $ 174,313 $ 133,299 Remaining lease term (years) 4 5 Discount rate 3.5 % 3.5 % The following table presents the maturities of lease liabilities as of March 31, 2022: Year Ending March 31 Operating Leases 2023 156,121 2024 159,592 2025 163,224 2026 165,947 Total lease payments 644,884 Imputed lease interest (42,745 ) Total lease liabilities $ 602,139

Note 8 - Concentrations

Note 8 - Concentrations	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	NOTE 8. The following table summarizes customers comprising 10% two % of Revenue for Year Ended March 31 2022 2021 Customer A 25 % 22 % Customer B 11 % 15 % These customers accounted for 34% of our accounts receivable as of March 31, 2022 March 31, 2021. not

Note 9 - Stock Repurchase Progr

Note 9 - Stock Repurchase Program	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Stock Repurchase Plan Disclosure [Text Block]	NOTE 9. On January 21, 2009 August 27, 2015, not not may 2022 2021. March 31, 2022. may

Note 10 - Information as to Emp

Note 10 - Information as to Employee Stock Purchase, Savings, and Similar Plans	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Retirement Benefits [Text Block]	NOTE 10. All of our employees are eligible to participate in our 401 first 21. may first 2022 2021.

Note 11 - Subsequent Events

Note 11 - Subsequent Events	12 Months Ended
	Mar. 31, 2022
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 11. On May 4, 2022 May 31, 2022 May 16, 2022 .

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Mar. 31, 2022
Accounting Policies [Abstract]
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents We consider all highly liquid investments with maturities of three
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair Value of Financial Instruments The carrying amount of cash and cash equivalents, accounts receivable, and accounts payable approximates fair value because of the short maturity of these instruments. Fair values of marketable securities are based on quoted market prices.
Concentration Of Risk and Financial Instruments Policy [Policy Text Block]	Concentration of Risk and Financial Instruments Financial instruments potentially subject to significant concentrations of credit risk consist principally of cash equivalents, marketable securities, and accounts receivable. Cash and cash equivalents have been maintained in financial institutions we believe have high credit quality, however these accounts are generally in excess of federally insured amounts. We have invested our excess cash in corporate-backed and municipal-backed bonds and money market instruments. Our investment policy prescribes purchases of only high-grade securities, and limits the amount of credit exposure to any one Our customers are throughout the world. We generally do not Additionally, we are dependent on critical suppliers including our packaging vendors and suppliers of certain raw silicon and semiconductor wafers that are incorporated in our products. The effects of the COVID- 19
Receivable [Policy Text Block]	Accounts Receivable and Allowance for Doubtful Accounts We grant credit to customers in the normal course of business and at times may 2022 2021.
Inventory, Policy [Policy Text Block]	Inventories Inventories are stated at the lower of cost or net realizable value. Cost is determined by the first first
Standard Product Warranty, Policy [Policy Text Block]	Product Warranty In general we warranty our products to be free from defects in material and workmanship for one
Property, Plant and Equipment, Policy [Policy Text Block]	Fixed Assets Fixed assets are stated at cost. Depreciation of machinery and equipment is recorded over the estimated useful lives of the assets, generally five five not 2022 2021. 2022 2021.
Revenue from Contract with Customer [Policy Text Block]	Revenue Recognition We recognize revenue when we satisfy performance obligations by the transfer of control of products or services to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those products or services. Revenue is disaggregated into product sales and contract research and development to depict the nature, amount, timing of revenue recognition and economic characteristics of our business, and is represented within the financial statements. We recognize revenue from product sales to customers and distributors when we satisfy our performance obligation, at a point in time, on product shipment or delivery to our customer or distributor as determined by agreed on shipping terms. Shipping charges billed to customers are included in product sales and the related shipping costs are included in cost of sales. Under certain limited circumstances, our distributors may third We recognize contract research and development revenue over a period of time as the performance obligation is satisfied over a period of time rather than a point in time. Contracts have specifications unique to each customer and do not Accounts receivable is recognized when we have transferred a good or service to a customer and our right to receive consideration is unconditional through the completion of our performance obligation. A contract asset is recognized when we have a right to consideration from the transfer of goods or services to a customer but have not not no March 31, 2022 March 31, 2021. Our performance obligations related to product sales and contract research and development contracts are satisfied in one one 606, Revenue from Contracts with Customers not not one
Income Tax, Policy [Policy Text Block]	Income Taxes We account for income taxes using the asset and liability method. Deferred income taxes are provided for temporary differences between the financial reporting and tax bases of assets and liabilities. We provide valuation allowances against deferred tax assets if we determine that it is less likely than not
Research and Development Expense, Policy [Policy Text Block]	Research and Development Expense Recognition Research and development costs are expensed as they are incurred. Customer-sponsored research and development costs are included in cost of sales.
Share-Based Payment Arrangement [Policy Text Block]	Stock-Based Compensation We measure stock-based compensation cost at the grant date based on the fair value of the award and recognize the compensation expense over the requisite service period, which is generally the vesting period. We recognize any forfeitures as they occur.
Earnings Per Share, Policy [Policy Text Block]	Net Income Per Share Net income per basic share is computed based on the weighted-average number of common shares issued and outstanding during each year. Net income per diluted share amounts assume exercise of all stock options. The following table shows the components of diluted shares: Year Ended March 31 2022 2021 Weighted average common shares outstanding – basic 4,833,661 4,834,054 Dilutive effect of stock options 1,978 408 Shares used in computing net income per share – diluted 4,835,639 4,834,462
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires us to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Standards Recently Adopted Accounting Standard In December 2019, No. 2019 12, 740 2019 12 740, 2019 12 June 30, 2021. no New Accounting Standard Not In May 2021, No. 2021 04, 260 470 50 718 815 40 2021 04 2021 04 December 15, 2021 2023 not

Note 2 - Summary of Significa_2

Note 2 - Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Mar. 31, 2022
Notes Tables
Schedule of Weighted Average Number of Shares [Table Text Block]	Year Ended March 31 2022 2021 Weighted average common shares outstanding – basic 4,833,661 4,834,054 Dilutive effect of stock options 1,978 408 Shares used in computing net income per share – diluted 4,835,639 4,834,462

Note 3 - Fair Value of Financ_2

Note 3 - Fair Value of Financial Instruments (Tables)	12 Months Ended
	Mar. 31, 2022
Notes Tables
Investments Classified by Contractual Maturity Date [Table Text Block]	Total <1 Year 1 3 Years 3 5 Years $ 51,910,887 $ 27,596,676 $ 24,314,211 $ -
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	As of March 31, 2022 As of March 31, 2021 Level 1 Level 2 Total Level 1 Level 2 Total Money market funds $ 6,756,993 $ - $ 6,756,993 $ 10,143,196 $ - $ 10,143,196 Corporate bonds - 45,153,894 45,153,894 - 54,717,626 54,717,626 Total $ 6,756,993 $ 45,153,894 $ 51,910,887 $ 10,143,196 $ 54,717,626 $ 64,860,822
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]	As of March 31, 2022 As of March 31, 2021 Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Estimated Fair Value Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Estimated Fair Value Money market funds $ 6,756,993 $ - $ - $ 6,756,993 $ 10,143,196 $ - $ - $ 10,143,196 Corporate bonds 45,561,114 230,085 (637,305 ) 45,153,894 53,308,105 1,570,195 (160,674 ) 54,717,626 Total $ 52,318,107 $ 230,085 $ (637,305 ) $ 51,910,887 $ 63,451,301 $ 1,570,195 $ (160,674 ) $ 64,860,822
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]	Less Than 12 Months 12 Months or Greater Total Estimated Fair Value Gross Unrealized Holding Losses Estimated Fair Value Gross Unrealized Holding Losses Estimated Fair Value Gross Unrealized Holding Losses As of March 31, 2022 Corporate bonds $ 6,306,750 $ (23,727 ) $ 9,738,338 $ (613,578 ) $ 16,045,088 $ (637,305 ) Total $ 6,306,750 $ (23,727 ) $ 9,738,338 $ (613,578 ) $ 16,045,088 $ (637,305 ) As of March 31, 2021 Corporate bonds $ 10,322,539 $ (160,674 ) $ - $ - $ 10,322,539 $ (160,674 ) Total $ 10,322,539 $ (160,674 ) $ - $ - $ 10,322,539 $ (160,674 )

Note 4 - Inventories (Tables)

Note 4 - Inventories (Tables)	12 Months Ended
	Mar. 31, 2022
Notes Tables
Schedule of Inventory, Current [Table Text Block]	March 31 2022 2021 Raw materials $ 987,062 $ 660,678 Work in process 3,355,838 2,220,723 Finished goods 745,735 1,019,376 Total inventories $ 5,088,635 $ 3,900,777

Note 5 - Stock-based Compensa_2

Note 5 - Stock-based Compensation (Tables)	12 Months Ended
	Mar. 31, 2022
Notes Tables
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Year Ended March 31 2022 2021 Risk-free interest rate 0.7 – 0.9% 0.2 – 0.4% Expected volatility 35 – 36% 34 – 35% Expected life (years) 4.6 4.6 Dividend yield 5.0 – 5.4% 7.0 – 7.4%
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]	Ranges of Exercise Prices Number Outstanding Weighted Average Exercise Price Weighted Remaining Contractual Life (years) $49.86 – $57.46 17,500 $ 55.94 4.0 $67.65 – $107.86 11,500 78.44 5.7 29,000 $ 69.52 5.0
Share-Based Payment Arrangement, Activity [Table Text Block]	Option Shares Reserved Options Outstanding Weighted Average Option Exercise Price At March 31, 2019 135,230 22,000 $ 70.89 Granted (4,000 ) 4,000 $ 67.65 Exercised - (2,000 ) $ 56.18 At March 31, 2020 131,230 24,000 $ 71.58 Granted (6,500 ) 6,500 $ 56.12 At March 31, 2021 124,730 30,500 $ 68.28 Granted (6,500 ) 6,500 $ 74.22 Exercised 5,000 (5,000 ) $ 61.36 Terminated 3,000 (3,000 ) $ 80.75 At March 31, 2022 126,230 29,000 $ 69.52

Note 6 - Income Taxes (Tables)

Note 6 - Income Taxes (Tables)	12 Months Ended
	Mar. 31, 2022
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year Ended March 31 2022 2021 Current taxes Federal $ 2,863,915 $ 2,600,670 State 140,822 75,852 Deferred taxes Federal (11,927 ) (123,959 ) State (499 ) (5,195 ) Income tax provision $ 2,992,312 $ 2,547,368
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended March 31 2022 2021 Tax expense at U.S. Statutory rate $ 3,674,961 $ 2,990,768 State income taxes, net of Federal benefit 136,144 88,909 Research and development credits (42,688 ) (86,223 ) Foreign-derived intangible income deduction (662,467 ) (450,912 ) Other (113,638 ) 4,826 Income tax provision $ 2,992,312 $ 2,547,368
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	March 31 2022 2021 Paid time off accrual $ 63,055 $ 60,869 Inventory reserve 47,042 50,324 Depreciation and amortization 88,690 88,690 Stock-based compensation deductions 88,710 75,189 Unrealized gain on marketable securities 89,102 (308,403 ) Other 106,870 106,869 Deferred tax assets $ 483,469 $ 73,538

Note 7 - Leases (Tables)

Note 7 - Leases (Tables)	12 Months Ended
	Mar. 31, 2022
Notes Tables
Lease, Cost [Table Text Block]	Year Ended March 31 2022 2021 Operating lease cost $ 170,062 $ 158,439 Variable lease cost 120,606 109,449 Total $ 290,668 $ 267,888 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for leases $ 174,313 $ 133,299 Remaining lease term (years) 4 5 Discount rate 3.5 % 3.5 %
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Year Ending March 31 Operating Leases 2023 156,121 2024 159,592 2025 163,224 2026 165,947 Total lease payments 644,884 Imputed lease interest (42,745 ) Total lease liabilities $ 602,139

Note 8 - Concentrations (Tables

Note 8 - Concentrations (Tables)	12 Months Ended
	Mar. 31, 2022
Notes Tables
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	% of Revenue for Year Ended March 31 2022 2021 Customer A 25 % 22 % Customer B 11 % 15 %

Note 1 - Description of Busin_2

Note 1 - Description of Business (Details Textual)	12 Months Ended
	Mar. 31, 2022
Number of Reportable Segments	1

Note 2 - Summary of Significa_3

Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accounts Receivable, Credit Loss Expense (Reversal)	$ 0	$ 0
Product Warranty Term (Year)	1 year
Impairment, Long-Lived Asset, Held-for-Use, Total	$ 0	0
Depreciation, Depletion and Amortization, Nonproduction, Total	$ 214,877	$ 308,511
Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	5 years

Note 2 - Summary of Significa_4

Note 2 - Summary of Significant Accounting Policies - Weighted Average Number of Shares (Details) - shares	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic (in shares)	4,833,661	4,834,054
Dilutive effect of stock options (in shares)	1,978	408
Shares used in computing net income per share – diluted (in shares)	4,835,639	4,834,462

Note 3 - Fair Value of Financ_3

Note 3 - Fair Value of Financial Instruments (Details Textual)	12 Months Ended
	Mar. 31, 2022
Available for Sale Debt Securitites, Percent of Total Assets	67.00%
Number of Other-than-temporarily Impaired Available-for-sale Securities	0
Number of Other-than-temporarily Impaired Marketable Securities	0
Minimum [Member]
Available for Sale Debt Securities, Remaining Maturity (Week)	77 days
Maximum [Member]
Available for Sale Debt Securities, Remaining Maturity (Week)	36 months

Note 3 - Fair Value of Financ_4

Note 3 - Fair Value of Financial Instruments - Fair Value of Available-for-sale Securities (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Total	$ 51,910,887	$ 64,860,822
Less than 1 year	27,596,676
1-3 years	24,314,211
3-5 years	$ 0

Note 3 - Fair Value of Financ_5

Note 3 - Fair Value of Financial Instruments - Assets Measured on Recurring Basis (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Total	$ 51,910,887	$ 64,860,822
Money Market Funds [Member]
Total	6,756,993	10,143,196
Corporate Bond Securities [Member]
Total	45,153,894	54,717,626
Fair Value, Recurring [Member]
Total	51,910,887	64,860,822
Fair Value, Recurring [Member] | Money Market Funds [Member]
Total	6,756,993	10,143,196
Fair Value, Recurring [Member] | Corporate Bond Securities [Member]
Total	45,153,894	54,717,626
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total	6,756,993	10,143,196
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Total	6,756,993	10,143,196
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Bond Securities [Member]
Total	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total	45,153,894	54,717,626
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Total	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member]
Total	$ 45,153,894	$ 54,717,626

Note 3 - Fair Value of Financ_6

Note 3 - Fair Value of Financial Instruments - Reconciliation of Available-for-sale Securities (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Amortized Cost	$ 52,318,107	$ 63,451,301
Gross Unrealized Holding Gains	230,085	1,570,195
Gross Unrealized Holding Losses	(637,305)	(160,674)
Estimated Fair Value	51,910,887	64,860,822
Money Market Funds [Member]
Amortized Cost	6,756,993	10,143,196
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	6,756,993	10,143,196
Corporate Bond Securities [Member]
Amortized Cost	45,561,114	53,308,105
Gross Unrealized Holding Gains	230,085	1,570,195
Gross Unrealized Holding Losses	(637,305)	(160,674)
Estimated Fair Value	$ 45,153,894	$ 54,717,626

Note 3 - Fair Value of Financ_7

Note 3 - Fair Value of Financial Instruments - Investment Securities With Unrealized Losses (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Fair market value, less than 12 months	$ 6,306,750	$ 10,322,539
Gross unrealized losses, less than 12 months	(23,727)	(160,674)
Fair market value, 12 months or greater	9,738,338	0
Gross unrealized losses, 12 months or greater	(613,578)	0
Total fair market value	16,045,088	10,322,539
Total gross unrealized losses	(637,305)	(160,674)
Corporate Bond Securities [Member]
Fair market value, less than 12 months	6,306,750	10,322,539
Gross unrealized losses, less than 12 months	(23,727)	(160,674)
Fair market value, 12 months or greater	9,738,338	0
Gross unrealized losses, 12 months or greater	(613,578)	0
Total fair market value	16,045,088	10,322,539
Total gross unrealized losses	$ (637,305)	$ (160,674)

Note 4 - Inventories - Summary

Note 4 - Inventories - Summary of Inventories (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Raw materials	$ 987,062	$ 660,678
Work in process	3,355,838	2,220,723
Finished goods	745,735	1,019,376
Total inventories	$ 5,088,635	$ 3,900,777

Note 5 - Stock-based Compensa_3

Note 5 - Stock-based Compensation (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	5 years
Share-Based Payment Arrangement, Expense	$ 81,855	$ 45,572
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit	$ 13,521	$ 9,971
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)	5 years	5 years 8 months 12 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number (in shares)	24,000	28,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value	$ 0
Share-based Compensation Arrangement by Share Based Payment Award Options Grants in Period Fair Value	81,855
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 3,133
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	1 year
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate	5.00%	7.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate	5.40%	7.40%

Note 5 - Stock-based Compensa_4

Note 5 - Stock-based Compensation - Schedule of Valuation Assumptions (Details)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Expected life (years) (Year)	4 years 7 months 6 days	4 years 7 months 6 days
Minimum [Member]
Risk-free interest rate	0.70%	0.20%
Expected volatility	35.00%	34.00%
Dividend yield	5.00%	7.00%
Maximum [Member]
Risk-free interest rate	0.90%	0.40%
Expected volatility	36.00%	35.00%
Dividend yield	5.40%	7.40%

Note 5 - Stock-based Compensa_5

Note 5 - Stock-based Compensation - Summary of Options Outstanding (Details)	12 Months Ended
	Mar. 31, 2022$ / sharesshares
Number outstanding (in shares) | shares	29,000
Weighted average exercise price (in dollars per share)	$ 69.52
Weighted average contractual life (Year)	5 years
Range One [Member]
Range of exercise prices, lower limit (in dollars per share)	$ 49.86
Range of exercise prices, upper limit (in dollars per share)	$ 57.46
Number outstanding (in shares) | shares	17,500
Weighted average exercise price (in dollars per share)	$ 55.94
Weighted average contractual life (Year)	4 years
Range Two [Member]
Range of exercise prices, lower limit (in dollars per share)	$ 67.65
Range of exercise prices, upper limit (in dollars per share)	$ 107.86
Number outstanding (in shares) | shares	11,500
Weighted average exercise price (in dollars per share)	$ 78.44
Weighted average contractual life (Year)	5 years 8 months 12 days

Note 5 - Stock-based Compensa_6

Note 5 - Stock-based Compensation - Summary of Stock Options (Details) - $ / shares	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Option Shares Reserved [Member]
Option shares reserved (in shares)	126,230	124,730	131,230	135,230
Granted (in shares)	(6,500)	(6,500)	(4,000)
Granted (in shares)	6,500	6,500	4,000
Exercised (in shares)	5,000		0
Exercised (in shares)	(5,000)		0
Terminated (in shares)	3,000
Terminated (in shares)	(3,000)
Share-Based Payment Arrangement, Option [Member]
Option shares reserved (in shares)	29,000	30,500	24,000	22,000
Weighted average option exercise price (in dollars per share)	$ 68.28	$ 71.58	$ 70.89
Granted (in shares)	(6,500)	(6,500)	(4,000)
Granted (in shares)	6,500	6,500	4,000
Granted, weighted average option exercise price (in dollars per share)	$ 74.22	$ 56.12	$ 67.65
Exercised (in shares)	5,000		2,000
Exercised (in shares)	(5,000)		(2,000)
Exercised, weighted average option exercise price (in dollars per share)	$ 61.36		$ 56.18
Terminated (in shares)	3,000
Terminated (in shares)	(3,000)
Terminated, weighted average option exercise price (in dollars per share)	$ 80.75
Weighted average option exercise price (in dollars per share)	$ 69.52	$ 68.28	$ 71.58

Note 6 - Income Taxes (Details

Note 6 - Income Taxes (Details Textual) $ in Thousands	12 Months Ended
	Mar. 31, 2022USD ($)
Unrecognized Tax Benefits, Ending Balance	$ 0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 0
Open Tax Year	2018 2019 2020

Note 6 - Income Taxes - Schedul

Note 6 - Income Taxes - Schedule of Income Tax Provisions (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Federal, Current taxes	$ 2,863,915	$ 2,600,670
State, Current taxes	140,822	75,852
Federal, Deferred taxes	(11,927)	(123,959)
State, Deferred taxes	(499)	(5,195)
Income tax provision	$ 2,992,312	$ 2,547,368

Note 6 - Income Taxes - Reconci

Note 6 - Income Taxes - Reconciliation of Income Tax Provisions (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Tax expense at U.S. Statutory rate	$ 3,674,961	$ 2,990,768
State income taxes, net of Federal benefit	136,144	88,909
Research and development credits	(42,688)	(86,223)
Foreign-derived intangible income deduction	(662,467)	(450,912)
Other	(113,638)	4,826
Income tax provision	$ 2,992,312	$ 2,547,368

Note 6 - Income Taxes - Deferre

Note 6 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Mar. 31, 2022	Mar. 31, 2021
Paid time off accrual	$ 63,055	$ 60,869
Inventory reserve	47,042	50,324
Depreciation and amortization	88,690	88,690
Stock-based compensation deductions	88,710	75,189
Unrealized gain on marketable securities, asset	89,102
Unrealized gain on marketable securities, liability		(308,403)
Other	106,870	106,869
Deferred tax assets	$ 483,469	$ 73,538

Note 7 - Leases - Operating Lea

Note 7 - Leases - Operating Lease (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating lease cost	$ 170,062	$ 158,439
Variable lease cost	120,606	109,449
Total	290,668	267,888
Operating cash flows for leases	$ 174,313	$ 133,299
Remaining lease term (years) (Month)	4 months	5 months
Discount rate	3.50%	3.50%

Note 7 - Leases - Maturities of

Note 7 - Leases - Maturities of Lease Liabilities (Details)	Mar. 31, 2022USD ($)
2023	$ 156,121
2024	159,592
2025	163,224
2026	165,947
Total lease payments	644,884
Imputed lease interest	(42,745)
Total lease liabilities	$ 602,139

Note 8 - Concentrations (Detail

Note 8 - Concentrations (Details Textual)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer A and B [Member]
Concentration Risk, Percentage	34.00%	37.00%

Note 8 - Concentrations - Reven

Note 8 - Concentrations - Revenue by Major Customers (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Customer A [Member]
Percentage of concentration	25.00%	22.00%
Customer B [Member]
Percentage of concentration	11.00%	15.00%

Note 9 - Stock Repurchase Pro_2

Note 9 - Stock Repurchase Program (Details Textual) - Repurchase Program 2009 [Member] - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Aug. 27, 2015	Jan. 21, 2009
Stock Repurchase Program, Authorized Amount				$ 2,500,000
Stock Repurchase Program Authorized Additional Amount			$ 5,000,000
Stock Repurchased During Period, Shares (in shares)	2,888	1,806
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 3,598,519

Note 10 - Information as to E_2

Note 10 - Information as to Employee Stock Purchase, Savings, and Similar Plans (Details Textual) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	100.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	3.00%
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 101,735	$ 94,498

Note 11 - Subsequent Events (De

Note 11 - Subsequent Events (Details Textual) - $ / shares	May 04, 2022	Mar. 31, 2022	Mar. 31, 2021
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 4	$ 4
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 1
Dividends Payable, Date to be Paid	May 31, 2022
Dividends Payable, Date of Record	May 16, 2022