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Note 3 - Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive (Loss) Income by Component (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Beginning balance $ 193,353 $ 184,066
Net current-period other comprehensive (loss) income (4,103) 1,013
Adoption of Accounting Standards Update 2016-01  
Ending balance 194,028 187,740
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Beginning balance (3,510) (3,363)
Other comprehensive (loss) income before reclassifications (4,102) 948
Amounts reclassified from accumulated other comprehensive income 6
Net current-period other comprehensive (loss) income (4,102) 954
Adoption of Accounting Standards Update 2016-01 (56)
Ending balance (7,668) (2,409)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Beginning balance (56) (45)
Other comprehensive (loss) income before reclassifications 10
Amounts reclassified from accumulated other comprehensive income (1) 49
Net current-period other comprehensive (loss) income (1) 59
Adoption of Accounting Standards Update 2016-01
Ending balance (57) 14
AOCI Attributable to Parent [Member]    
Beginning balance (3,566) (3,408)
Other comprehensive (loss) income before reclassifications (4,102) 958
Amounts reclassified from accumulated other comprehensive income (1) 55
Net current-period other comprehensive (loss) income (4,103) 1,013
Adoption of Accounting Standards Update 2016-01 (56)
Ending balance $ (7,725) $ (2,395)