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Note 13 - Stockholders' Equity (Details) - Components of Accumulated Other Comprehensive Loss and Changes During the Year: - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax $ (2,907) $ (11,375) $ 12,137
Net current period other comprehensive income (loss), net of tax (2,655) 8,468 (23,512)
Ending balance, net of tax (5,562) (2,907) (11,375)
Other comprehensive income (loss) before reclassifications, net of tax (3,203) 9,758 (23,280)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 548 (1,290) (232)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax 3,392 (8,522) 18,921
Net current period other comprehensive income (loss), net of tax (3,913) 11,914 (27,443)
Ending balance, net of tax (521) 3,392 (8,522)
Other comprehensive income (loss) before reclassifications, net of tax (3,818) 13,548 (26,541)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (95) (1,634) (902)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, net of tax (6,299) (2,853) (6,784)
Net current period other comprehensive income (loss), net of tax 1,258 (3,446) 3,931
Ending balance, net of tax (5,041) (6,299) (2,853)
Other comprehensive income (loss) before reclassifications, net of tax 615 (3,790) 3,261
Amounts reclassified from accumulated other comprehensive income (loss), net of tax $ 643 $ 344 $ 670