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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended		12 Months Ended
	Feb. 27, 2022	Mar. 31, 2022	May 31, 2021	Mar. 31, 2020	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	May 31, 2017	Dec. 31, 2012	Nov. 30, 2010
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					74,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 10.73
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)					7 years 1 month 13 days
Weighted Average Number of Shares Outstanding, Diluted, Adjustment, Total (in shares)					191,170
Earnings Per Share, Diluted Adjustment (in dollars per share)					$ 0.02
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)		450,900			450,900		387,500
Letters of Credit Outstanding, Amount		$ 400			$ 400
Restricted Cash and Cash Equivalents, Current, Total		776			776	$ 598	$ 1,582
Accounts Receivable, Allowance for Credit Loss, Current		366			$ 366		328
Finite-Lived Intangible Assets, Remaining Amortization Period (Year)					2 years 6 months
Amortization of Intangible Assets					$ 36	$ 46	$ 176
Employee Service-based Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	21,000
Employee Market Condition Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	21,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					74,000	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Shares Grants in Period, Gross (in shares)					32,000
Share-Based Payment Arrangement, Expense					$ 43	$ 21
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 816			$ 816
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					3 years 11 months 15 days
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)		21,000			21,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)		51,911			51,911
Stock Appreciation Rights (SARs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)		0			0				100,000
Equity Appreciation Right Units [Member]
Share-Based Payment Arrangement, Expense					$ 0	$ 143
Stock Incentive Plan 2017 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)								350,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)			75,000	50,000
Stock Incentive Plan 2017 [Member] \| Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 243			$ 243
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					1 year 11 months 15 days
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)					$ 11.80
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)					9 years 11 months 15 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 0
Stock Incentive Plan 2017 [Member] \| Restricted Stock Units (RSUs) [Member] \| Non-employee Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					21,000
Share-Based Payment Arrangement, Expense					$ 5	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)					2 years
Equity Appreciation Rights Plan 2010 [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)										1,000,000