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Note 12 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Beginning balance $ 350,714 [1] $ 339,057
Other comprehensive income (loss), net (1,641) 530
Ending balance 342,037 343,404
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Beginning balance 975 (544)
Other comprehensive loss before reclassifications (1,697) 407
Reclassified from AOCI
Other comprehensive income (loss), net (1,697) 407
Ending balance (722) (137)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Beginning balance (1,815) (1,467)
Other comprehensive loss before reclassifications 83
Reclassified from AOCI 56 40
Other comprehensive income (loss), net 56 123
Ending balance (1,759) (1,344)
AOCI Attributable to Parent [Member]    
Beginning balance (840) (2,011)
Other comprehensive loss before reclassifications (1,697) 490
Reclassified from AOCI 56 40
Other comprehensive income (loss), net (1,641) 530
Ending balance $ (2,481) $ (1,481)
[1] Derived from audited financial statements