Note 16 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Beginning Balance	$ 1,582,000	$ 1,404,000
Additions based on tax positions related to the current year	159,000	181,000
Decreases related to prior years’ tax positions	(890,000)	(3,000)
Ending Balance	$ 851,000	$ 1,582,000