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Note 5 - Accumulated Other Comprehensive Income (Details) - Changes in Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Changes in Accumulated Other Comprehensive Income (Loss) by Component Net of Tax [Abstract]    
Beginning balance $ 2,548us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1] $ (2,237)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1]
Other comprehensive income (loss) before reclassification 562us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax [1] 1,847us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax [1]
Amount reclassified from accumulated other comprehensive income (loss) (16)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1] 4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1]
Period change 546us-gaap_OtherComprehensiveIncomeLossNetOfTax [1] 1,851us-gaap_OtherComprehensiveIncomeLossNetOfTax [1]
Ending balance $ 3,094us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1] $ (386)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1]
[1] Amounts in parentheses indicate debits to net income