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Note 6 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		9 Months Ended	12 Months Ended
	Jan. 31, 2018	Jun. 30, 2014	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Jul. 31, 2021	Dec. 31, 2019	Jun. 30, 2004
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)				1,306,824	1,217,163		1,541,792
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 850
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)				$ 2.90	$ 2.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 738	$ 427
Proceeds from Stock Options Exercised			$ 398	$ 398	$ 238
Common Stock, Capital Shares Reserved for Future Issuance (in shares)				941,986
Restricted Stock [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 17
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)				1 year 2 months 12 days
The 2004 Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)					2,900,000			750,000
The 2014 Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)		1,750,000				2,750,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)				1,306,824
The 2014 Long-term Incentive Plan [Member] | Awards Other than Stock Options and SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)		800,000
The 2014 Long-term Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		7 years

X

- Definition

Aggregate number of common shares reserved for future issuance.

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-SubTopic 10
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