Note 7 - Income Tax Expense - Income Tax Provisions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal	$ 3,049	$ 3,613	$ 2,846
Tax Cut and Jobs Act			265
State and local	1,074	643	647
Foreign	502	789	338
	4,625	5,045	4,096
Tax Cut and Jobs Act			1,336
Deferred tax (benefit) provision	(1,405)	(625)	1,899
Tax Cut and Jobs Act re-measurement			2,429
	(1,405)	(625)	4,328
Income tax expense	$ 3,220	$ 4,420	$ 9,760