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Note 18 - Accumulated Other Comprehensive Income (Loss) Rollforward of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Balance at beginning of period, net of tax $ 23,085    
Unrealized holding gains (losses) arising during the period, net of tax (97,356) $ 31,903 $ 8,782
Less: Reclassification adjustment for net gains (losses) included in net income, net of tax (10,270) (2,642) 2,251
Net unrealized gains (losses) on investments, net of tax (87,086) 34,545 6,531
Unrealized foreign currency translation adjustments, net of tax 5 150 (474)
Less: Reclassification adjustment for liquidation of foreign subsidiary and other adjustments included in net income, net of tax 1 (721) 0
Net foreign currency translation adjustments 4 871 (474)
Net actuarial gains (losses), net of tax 129 64 25
OCI, net of tax (86,953) 35,480 6,082
Balance at end of period, net of tax (60,920) 23,085  
Other Comprehensive Income (Loss)      
Other Comprehensive Income (Loss), before Tax [Abstract]      
Balance at beginning of period, before tax 32,669 (19,063) (28,425)
Balance adjusted for cumulative effect of adopting accounting standard updates, before tax 32,953    
Unrealized holding gains (losses) arising during the period, before tax (123,235) 46,235 13,510
Less: Reclassification adjustment for net gains (losses) included in net income, before tax [1] (13,000) (4,065) 3,463
Net unrealized gains (losses) on investments (110,235) 50,300 10,047
Unrealized foreign currency translation adjustments, before tax   225  
Less: Reclassification adjustment for liquidation of foreign subsidiary and other adjustments included in net income, before tax [2]   (1,109)  
Net foreign currency translation adjustments, before tax 5 1,334 (724)
Net actuarial gain (loss), before tax 163 98 39
OCI, before tax (110,067) 51,732 9,362
Balance at end of period, before tax (77,114) 32,669 (19,063)
Other Comprehensive Income (Loss), Tax [Abstract]      
Balance at beginning of period, tax 9,584 (6,668) (9,948)
Balance adjusted for cumulative effect of adopting accounting standard updates, tax 6,920    
Unrealized holding gains (losses) arising during the period, tax (25,879) 14,332 4,728
Less: Reclassification adjustment for net gains (losses) included in net income, tax [1] (2,730) (1,423) 1,212
Net unrealized gains (losses) on investments, tax (23,149) 15,755 3,516
Unrealized foreign currency translation adjustments, tax   75  
Less: Reclassification adjustment for liquidation of foreign subsidiary and other adjustments included in net income, tax [2]   (388)  
Net foreign currency translation adjustments, tax 1 463 (250)
Net actuarial gains (losses), tax 34 34 14
OCI, tax (23,114) 16,252 3,280
Balance at end of period, tax (16,194) 9,584 (6,668)
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Balance at beginning of period, net of tax 23,085 (12,395) (18,477)
Balance adjusted for cumulative effect of adopting accounting standard updates, net of tax 26,033    
Unrealized holding gains (losses) arising during the period, net of tax (97,356) 31,903 8,782
Less: Reclassification adjustment for net gains (losses) included in net income, net of tax [1] (10,270) (2,642) 2,251
Net unrealized gains (losses) on investments, net of tax (87,086) 34,545 6,531
Unrealized foreign currency translation adjustments, net of tax   150  
Less: Reclassification adjustment for liquidation of foreign subsidiary and other adjustments included in net income, net of tax [2]   (721)  
Net foreign currency translation adjustments 4 871 (474)
Net actuarial gains (losses), net of tax 129 64 25
OCI, net of tax (86,953) 35,480 6,082
Balance at end of period, net of tax (60,920) $ 23,085 $ (12,395)
ASU 2016-01 | Other Comprehensive Income (Loss)      
Other Comprehensive Income (Loss), before Tax [Abstract]      
Cumulative effect of adopting the accounting standard update, before tax 284    
Other Comprehensive Income (Loss), Tax [Abstract]      
Cumulative effect of adopting the accounting standard update, tax 60    
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Cumulative effect of adopting the accounting standard update for financial instruments, net of tax 224    
ASU 2018-02 | Other Comprehensive Income (Loss)      
Other Comprehensive Income (Loss), before Tax [Abstract]      
Cumulative effect of adopting the accounting standard update, before tax 0    
Other Comprehensive Income (Loss), Tax [Abstract]      
Cumulative effect of adopting the accounting standard update, tax (2,724)    
Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Cumulative effect of adopting the accounting standard update for financial instruments, net of tax $ 2,724    
[1] Included in net gains (losses) on investments and other financial instruments in our consolidated statements of operations.
[2] Included in restructuring and other exit costs in our consolidated statements of operations.