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Note 11 - Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net gain on sale of securities $ 1,000
Income before income taxes 9,257,000 9,013,000
Income tax expense 3,055,000 2,929,000
Net income 6,202,000 6,084,000
Reclassified out of AOCI, net of tax 40,000 43,000
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]    
Reclassified out of AOCI [1] 57,000 57,000
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Reclassified out of AOCI [1] 7,000 14,000
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Reclassified out of AOCI 64,000 71,000
Income tax expense 24,000 27,000
Reclassified out of AOCI, net of tax 40,000 44,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Net gain on sale of securities (1,000)
Net impairment losses recognized in earnings
Income before income taxes (1,000)
Income tax expense 0
Net income $ (1,000)
[1] Amortization is included in net periodic pension cost. See Note 10, "Employee Benefit Plans."