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Note 9 - Stock Compensation Plans (Details Textual) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Mar. 21, 2022	Dec. 31, 2009
Share-based Payment Arrangement, Expense			$ 1.0	$ 1.2
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	$ 0.2	$ 0.2
Subsequent Event [Member]
Share Price (in dollars per share)					$ 3.74
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value			$ 0.7	$ 0.2
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)			1,401,171
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					$ 0.7