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Note 14 - Accumulated Other Comprehensive Income (Details) - Changes in Accumulated Other Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance, net of tax     $ (2,907) $ (11,375)
Net current period other comprehensive income, net of tax $ (5,349) $ 6,604 (849) 12,024
Ending balance, net of tax (3,756) 649 (3,756) 649
Other comprehensive income before reclassifications, net of tax     (1,145) 11,873
Amounts reclassified from accumulated other comprehensive income, net of tax     296 151
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)
Net current period other comprehensive income, net of tax     (1,181) 11,873
Ending balance, net of tax 2,211 3,351 2,211 3,351
Other comprehensive income before reclassifications, net of tax     (1,145) 11,873
Amounts reclassified from accumulated other comprehensive income, net of tax     (36)  
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)
Net current period other comprehensive income, net of tax     332 151
Ending balance, net of tax $ (5,967) $ (2,702) (5,967) (2,702)
Amounts reclassified from accumulated other comprehensive income, net of tax     $ 332 $ 151