Note 1 - Financial Statement Presentation and Significant Accounting Policies (Details Textual) $ in Thousands	3 Months Ended
Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2021 USD ($)
Number of Wholly-Owned Subsidiaries	6
Retained Earnings (Accumulated Deficit)	$ 31,155	$ 30,875
Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings (Accumulated Deficit)			$ 0

Amount of accumulated undistributed earnings (deficit).

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