Note 14 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Expense (Benefit), Total	$ (9,625,000)	$ 7,392,000
Effective Income Tax Rate Reconciliation, Percent, Total	26.40%	25.80%
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount, Total	$ 205,000	$ 200,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	$ (60,392,000)	6,838,000
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount		$ (228,000)