Note 14 - Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance	$ 1,220,000	$ 1,132,000
Increases due to tax positions related to a prior year	65,000	88,000	1,132,000
Decreases to tax positions as a result of a lapse of statute	(1,285,000)
Balance	$ 0	$ 1,220,000	$ 1,132,000