Note 14 - Income Taxes - Unrecognized Tax Benefit Roll Forward (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 223,000	$ 450,000
Additions (deletions) based upon tax positions related to the current year	22,000	(227,000)
Balance	$ 245,000	$ 223,000