Note 14 - Federal and State Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized tax benefits that would impact effective tax rate	$ 1,400
Unrecognized tax benefits, interest on income taxes accrued	$ 277	$ 232
Effective income tax rate	21.00%	21.00%	21.00%
Domestic Tax Authority [Member]
Deferred tax assets, operating loss carryforwards, subject to expiration	$ 3,000
State and Local Jurisdiction [Member]
Deferred tax assets, operating loss carryforwards, subject to expiration	$ 2,100