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Note 7 - Stock Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2019
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		13,000		13,000
Share Price (in dollars per share)		$ 19.33
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 2,200
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		3 years 8 months 12 days
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		19
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		78
The 2019 Plan [Member] | Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)					1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Pursuant to Exercise of Incentive Stock Options (in shares)					1,000,000
The 2019 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Employee or Consultant [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)					250,000
The 2019 Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Non-employee Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)					50,000
The 2019 Plan [Member] | Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)		664
The 2019 Plan [Member] | Restricted Stock [Member] | Board of Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)		3,984	8,166
Stock Issued During Period, Value, Issued for Services		$ 69	$ 82
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		3,320	6,805
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)		3 months	3 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			1,361
The 2019 Plan [Member] | Restricted Stock [Member] | An Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)		44,871
Stock Issued During Period, Value, Issued for Services			$ 764
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		41,066
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)		3 months
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		3,805
The 2019 Plan [Member] | Restricted Stock [Member] | Workforce for Services [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)		28,735
Stock Issued During Period, Value, Issued for Services		$ 537
Share Purchase Match Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Matching Percentage of Common Stock Purchased	20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Matching of Common Stock Purchased per Individual Within a Calendar Year	$ 25
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)		4,000	4,000
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture		$ 76	$ 61
Share Purchase Match Program [Member] | Restricted Stock [Member] | Board of Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)			1,200
Stock Issued During Period, Value, Issued for Services			$ 12

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- Definition

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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