Note 9 - Income Taxes - Allocation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current	$ 2,682	$ 2,942	$ 2,943
Deferred expense (benefit)	529	(382)	1,790
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			1,560
Total income tax expense	$ 3,211	$ 2,560	$ 6,293