Note 7 - Taxes on Income - Income Tax Provisions (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal		$ 3,613	$ 2,846	$ 5,642
Tax Cut and Jobs Act			265
State and local		643	647	628
Foreign		789	338
		5,045	4,096	6,270
Tax Cut and Jobs Act			1,336
Deferred Taxes:
Deferred tax (benefit) provision		(625)	1,899	(1,010)
Tax Cut and Jobs Act re-measurement			2,429
		(625)	4,328	(1,010)
	$ 5,000	$ 4,420	$ 9,760	$ 5,260