Note 14 - Income Taxes - Provision for Income Taxes (Details) - USD ($)		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current, federal		$ 3,941,000	$ 3,124,000	$ 5,170,000
Current, State		2,093,000	1,650,000	1,643,000
Current, Total		6,034,000	4,774,000	6,813,000
Deferred, federal		(128,000)	211,000	(738,000)
Deferred, State		(38,000)	149,000	(178,000)
Deferred, Total		(166,000)	360,000	(916,000)
Provision for income taxes, federal		3,813,000	3,335,000	5,851,000
Provision for income taxes, State		2,055,000	1,799,000	1,465,000
Provision for income taxes, Total		$ 5,868,000	$ 5,134,000	7,316,000
Deferred tax asset adjustment for enacted change in tax rate	$ 1,419,000			$ 1,419,000