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Note 10 - Stock Compensation Plans (Details Textual) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 04, 2021	Dec. 31, 2009
Share-based Payment Arrangement, Expense		$ 1.2	$ 1.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)		0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)					250,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)		86,383
Forecast [Member]
Share-based Payment Arrangement, Expense	$ 1.1
Subsequent Event [Member]
Share Price (in dollars per share)				$ 1.63
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 0.2	$ 0.9
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)		4,850,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)		1,434,701
Restricted Stock Units (RSUs) [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding				$ 0.5