Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	21.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ (1,670)	$ 6,550
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total			$ 0	$ 0
Deferred Tax Assets, Valuation Allowance, Total			$ 0	$ 0