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Note 11 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Beginning balance     $ 339,057,000 $ 343,017,000
Other comprehensive income (loss), net $ 1,480,000 $ 2,716,000 2,010,000 2,230,000
Ending balance 348,775,000 334,212,000 348,775,000 334,212,000
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Beginning balance (137,000) (4,337,000) (544,000) (3,885,000)
Other comprehensive income (loss) before reclassifications 1,028,000 2,575,000 1,435,000 2,123,000
Reclassified from AOCI 411,000 56,000 411,000 56,000
Other comprehensive income (loss), net 1,439,000 2,631,000 1,846,000 2,179,000
Ending balance 1,302,000 (1,706,000) 1,302,000 (1,706,000)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Beginning balance (1,344,000) (1,396,000) (1,467,000) (1,362,000)
Other comprehensive income (loss) before reclassifications 44,000 83,000 (34,000)
Reclassified from AOCI 41,000 41,000 81,000 85,000
Other comprehensive income (loss), net 41,000 85,000 164,000 51,000
Ending balance (1,303,000) (1,311,000) (1,303,000) (1,311,000)
AOCI Attributable to Parent [Member]        
Beginning balance (1,481,000) (5,733,000) (2,011,000) (5,247,000)
Other comprehensive income (loss) before reclassifications 1,028,000 2,619,000 1,518,000 2,089,000
Reclassified from AOCI 452,000 97,000 492,000 141,000
Other comprehensive income (loss), net 1,480,000 2,716,000 2,010,000 2,230,000
Ending balance $ (1,000) $ (3,017,000) $ (1,000) $ (3,017,000)