Note 10 - Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Components of Deferred Tax Assets [Abstract]
Accrued expenses	$ 11,642	$ 17,487
Unearned premiums	34,394	34,686
Differences in fair value of financial instruments	0	1,115
Net unrealized loss on investments	0	16,297
State income taxes	65,917	67,069
Loss reserves	1,920	1,044
Goodwill and intangibles	36,282	35,068
Deferred policy acquisition and ceding commission costs	11,190	15,288
Share-based compensation	11,238	10,776
Lease liability	13,293	0
Other	11,188	13,091
Total deferred tax assets	197,064	211,921
Components of Deferred Tax Liabilities [Abstract]
Differences in fair value of financial instruments	5,708	0
Net unrealized gain on investments	29,303	0
Depreciation	12,803	12,201
Contingency reserve	137,983	0
Other	15,914	3,581
Total deferred tax liabilities	201,711	15,782
Less: Valuation allowance	66,437	64,496
Net deferred tax asset (liability)	(71,084)
Net deferred tax asset (liability)	$ 0	$ 131,643