Note 9 - Commitments and Contingencies (Details Textual) - SBS Bankruptcy and Settlement [Member] - Robert G. Brown [Member] - USD ($)		3 Months Ended	12 Months Ended
	Sep. 20, 2019	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loss Contingency Accrual, Ending Balance		$ 325,000
Loss Contingency, Damages Sought, Value	$ 1,300,000
Loss Contingency, Damages Paid, Value		$ 325,000	$ 325,000	$ 325,000	$ 325,000