Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Open Tax Year	2015 2016 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Increase (Decrease) in Deferred Tax Liabilities Resulting From Tax Act		$ 6,200
Income Tax Expense (Benefit), Total	$ 12,305	$ (2,613)	$ 1,498
Effective Income Tax Rate Reconciliation, Percent, Total	26.70%	(16.00%)	356.60%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount			$ 900
Income Taxes Paid, Net, Total	$ 11,300	$ 9,400	$ 1,000
Restatement Adjustment [Member]
Income Tax Expense (Benefit), Total		$ (1,900)