Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Income Tax Assets, Net, Total		$ 2,933	$ 163
Deferred Income Tax Liabilities, Net, Total		96,328	71,300
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		(778)	(1,015)	$ 2,454
Tax Credit Carry Forward State Research and Development		8,291
Tax Credit Carryforward State Manufacturing		12,747
Unrecognized Tax Benefits, Interest on Income Taxes Expense		71	37
Unrecognized Tax Benefits, Income Tax Penalties Expense		$ 195	$ 136
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Liability, Income Tax Benefit	$ 28,400