Note 14 - Income Taxes (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Dec. 22, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Liabilities, Indefinite-lived Intangible Assets		$ 1,900
Deferred Tax Liabilities, Finite-lived Intangible Assets		800
Deferred Tax Assets, Valuation Allowance, Total		20,281	$ 17,662
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		2,600	(5,800)	$ 2,700
Operating Loss Carryforwards, Total		$ 67,800	62,800	$ 2,200
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
Effective Income Tax Rate Reconciliation, Percent, Total	26.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ (887)
Deferred Tax Liabilities, Gross, Total		$ 2,838	3,100
Foreign Tax Authority [Member]
Deferred Tax Liabilities, Gross, Total			$ 0