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Note 5 - Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Beginning balance 1 $ 1,576,000 $ 1,407,287
Ending balance 1,610,706 1,432,493
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Equity Securities [Member]    
Beginning balance 1 [1] 3,992
Adoption of accounting standards (3,992)
Ending balance
[1] All amounts net-of-tax.