Note 12 - Taxes on Income - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income taxes (benefit) at U.S. federal statutory tax rate	$ 6,315	$ (4,196)	$ (854)
State income taxes, net of federal income tax benefit	1,051	2,033	(791)
Divestitures	(501)	5,613	2,133
Meals and entertainment	271	442	482
Changes in taxes previously accrued	45	(1,557)	(573)
Foreign tax rate differences	(176)	(643)	1,301
Share-based compensation	572	358	(1,427)
Goodwill impairment	0	0	291
Recognition of uncertain tax positions	(504)	(717)	(218)
Deemed mandatory repatriation	0	0	(842)
Other matters	(588)	(1,154)	(821)
Total tax provision	$ 5,267	$ 4,010	$ (1,293)
Effective tax rate	17.50%	(20.10%)	31.80%
Foreign Tax Authority [Member]
Change in the balance of the valuation allowance for deferred tax assets allocated to foreign income tax expense	$ 38	$ 806	$ 590
Domestic Tax Authority [Member]
Change in the balance of the valuation allowance for deferred tax assets allocated to foreign income tax expense	$ (1,256)	$ 3,025	$ (564)