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Note 14 - Accumulated Other Comprehensive Income (Loss) (Details) - Changes in Accumulated Other Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax $ (3,756) $ 649 $ (2,907) $ (11,375)
Net current period other comprehensive income, net of tax 4,052 (5,092) 3,203 6,932
Ending balance, net of tax 296 (4,443) 296 (4,443)
Other comprehensive income before reclassifications, net of tax 3,943 (2,206) 2,798 9,667
Amounts reclassified from accumulated other comprehensive income, net of tax 109 (2,886) 405 (2,735)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax 2,211 3,351 3,392 (8,522)
Net current period other comprehensive income, net of tax 3,885 (5,184) 2,704 6,689
Ending balance, net of tax 6,096 (1,833) 6,096 (1,833)
Other comprehensive income before reclassifications, net of tax 3,943 (2,206) 2,798 9,667
Amounts reclassified from accumulated other comprehensive income, net of tax (58) (2,978) (94) (2,978)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax (5,967) (2,702) (6,299) (2,853)
Net current period other comprehensive income, net of tax 167 92 499 243
Ending balance, net of tax (5,800) (2,610) (5,800) (2,610)
Other comprehensive income before reclassifications, net of tax 0 0 0 0
Amounts reclassified from accumulated other comprehensive income, net of tax $ 167 $ 92 $ 499 $ 243