Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, plant and equipment	$ (3,894)	$ (3,336)
Prepaid expenses	(7)	(325)
Accrued stock compensation and other employee benefits	3,055	2,722
Accrued restructuring costs and other expenses	3,806	2,541
Tax credit carryforwards	5,251	5,233
Net operating losses carried forward	18,330	18,628
Undistributed earnings	(2,282)	0
Intangibles and goodwill	(18,804)	(21,153)
Translation adjustments and withholding taxes	(1,637)	(3,472)
Other	(955)	540
Net long-term deferred tax assets	2,863	1,378
Valuation allowance	(15,838)	(15,231)
Total net deferred tax asset (liability)	$ (12,975)	$ (13,853)