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Note 5 - Accumulated Other Comprehensive Income (Details) - Significant Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Significant Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) [Abstract]    
Unrealized gains (losses) on available-for-sale securities, before taxes $ 24us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax [1] $ (6)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax [1]
Amounts in parentheses indicate debits to net income, tax (8)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax [1] 2us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax [1]
Amounts in parentheses indicate debits to net income, net of tax $ 16us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1] $ (4)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [1]
[1] Amounts in parentheses indicate debits to net income