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Note 20 - Selected Quarterly Financial Data (Unaudited) (Details) - Selected Quarterly Financial Data (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Selected Quarterly Financial Data (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 7,055 us-gaap_InterestIncomeOperating | $ 6,911 us-gaap_InterestIncomeOperating | $ 6,919 us-gaap_InterestIncomeOperating | $ 6,989 us-gaap_InterestIncomeOperating | $ 7,043 us-gaap_InterestIncomeOperating | $ 7,174 us-gaap_InterestIncomeOperating | $ 6,947 us-gaap_InterestIncomeOperating | $ 7,014 us-gaap_InterestIncomeOperating |  |  |
Total interest expense | 1,005 us-gaap_InterestExpense | 999 us-gaap_InterestExpense | 1,033 us-gaap_InterestExpense | 1,033 us-gaap_InterestExpense | 1,136 us-gaap_InterestExpense | 1,328 us-gaap_InterestExpense | 1,357 us-gaap_InterestExpense | 1,429 us-gaap_InterestExpense | 4,070 us-gaap_InterestExpense | 5,250 us-gaap_InterestExpense | 6,447 us-gaap_InterestExpense
Net interest income | 6,050 us-gaap_InterestIncomeExpenseNet | 5,912 us-gaap_InterestIncomeExpenseNet | 5,886 us-gaap_InterestIncomeExpenseNet | 5,956 us-gaap_InterestIncomeExpenseNet | 5,907 us-gaap_InterestIncomeExpenseNet | 5,846 us-gaap_InterestIncomeExpenseNet | 5,590 us-gaap_InterestIncomeExpenseNet | 5,585 us-gaap_InterestIncomeExpenseNet | 23,804 us-gaap_InterestIncomeExpenseNet | 22,928 us-gaap_InterestIncomeExpenseNet | 22,299 us-gaap_InterestIncomeExpenseNet
Provision for loan losses |  | 70 us-gaap_ProvisionForLoanAndLeaseLosses | 120 us-gaap_ProvisionForLoanAndLeaseLosses | 180 us-gaap_ProvisionForLoanAndLeaseLosses | (570)us-gaap_ProvisionForLoanAndLeaseLosses | 153 us-gaap_ProvisionForLoanAndLeaseLosses | 300 us-gaap_ProvisionForLoanAndLeaseLosses | 313 us-gaap_ProvisionForLoanAndLeaseLosses | 370 us-gaap_ProvisionForLoanAndLeaseLosses | 196 us-gaap_ProvisionForLoanAndLeaseLosses | 2,168 us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses | 6,050 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 5,842 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 5,766 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 5,776 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 6,477 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 5,693 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 5,290 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 5,272 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 23,434 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 22,732 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 20,131 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Total noninterest income | 1,026 us-gaap_NoninterestIncome | 990 us-gaap_NoninterestIncome | 857 us-gaap_NoninterestIncome | 715 us-gaap_NoninterestIncome | 650 us-gaap_NoninterestIncome | 808 us-gaap_NoninterestIncome | 819 us-gaap_NoninterestIncome | 868 us-gaap_NoninterestIncome | 3,588 us-gaap_NoninterestIncome | 3,145 us-gaap_NoninterestIncome | 3,451 us-gaap_NoninterestIncome
Total noninterest expense | 4,638 us-gaap_NoninterestExpense | 4,385 us-gaap_NoninterestExpense | 4,598 us-gaap_NoninterestExpense | 4,229 us-gaap_NoninterestExpense | 4,806 us-gaap_NoninterestExpense | 4,115 us-gaap_NoninterestExpense | 3,948 us-gaap_NoninterestExpense | 4,001 us-gaap_NoninterestExpense | 17,850 us-gaap_NoninterestExpense | 16,870 us-gaap_NoninterestExpense | 15,639 us-gaap_NoninterestExpense
Income before income taxes | 2,438 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,447 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,025 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,262 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,321 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,386 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,161 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,139 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 9,172 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 9,007 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,943 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income taxes | 550 us-gaap_IncomeTaxExpenseBenefit | 529 us-gaap_IncomeTaxExpenseBenefit | 414 us-gaap_IncomeTaxExpenseBenefit | 499 us-gaap_IncomeTaxExpenseBenefit | 500 us-gaap_IncomeTaxExpenseBenefit | 521 us-gaap_IncomeTaxExpenseBenefit | 476 us-gaap_IncomeTaxExpenseBenefit | 482 us-gaap_IncomeTaxExpenseBenefit | 1,992 us-gaap_IncomeTaxExpenseBenefit | 1,979 us-gaap_IncomeTaxExpenseBenefit | 1,662 us-gaap_IncomeTaxExpenseBenefit
Net income | $ 1,888 us-gaap_NetIncomeLoss | $ 1,918 us-gaap_NetIncomeLoss | $ 1,611 us-gaap_NetIncomeLoss | $ 1,763 us-gaap_NetIncomeLoss | $ 1,821 us-gaap_NetIncomeLoss | $ 1,865 us-gaap_NetIncomeLoss | $ 1,685 us-gaap_NetIncomeLoss | $ 1,657 us-gaap_NetIncomeLoss | $ 7,180 us-gaap_NetIncomeLoss | $ 7,028 us-gaap_NetIncomeLoss | $ 6,281 us-gaap_NetIncomeLoss
Net income |  |  |  |  |  |  |  |  |  |  |
Basic (in Dollars per share) | $ 0.92 us-gaap_EarningsPerShareBasic | $ 0.94 us-gaap_EarningsPerShareBasic | $ 0.79 us-gaap_EarningsPerShareBasic | $ 0.87 us-gaap_EarningsPerShareBasic | $ 0.90 us-gaap_EarningsPerShareBasic | $ 0.92 us-gaap_EarningsPerShareBasic | $ 0.82 us-gaap_EarningsPerShareBasic | $ 0.84 us-gaap_EarningsPerShareBasic | $ 3.52 us-gaap_EarningsPerShareBasic | $ 3.48 us-gaap_EarningsPerShareBasic | $ 3.29 us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share) | $ 0.92 us-gaap_EarningsPerShareDiluted | $ 0.93 us-gaap_EarningsPerShareDiluted | $ 0.79 us-gaap_EarningsPerShareDiluted | $ 0.86 us-gaap_EarningsPerShareDiluted | $ 0.90 us-gaap_EarningsPerShareDiluted | $ 0.92 us-gaap_EarningsPerShareDiluted | $ 0.82 us-gaap_EarningsPerShareDiluted | $ 0.83 us-gaap_EarningsPerShareDiluted | $ 3.50 us-gaap_EarningsPerShareDiluted | $ 3.47 us-gaap_EarningsPerShareDiluted | $ 3.28 us-gaap_EarningsPerShareDiluted
Average shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in Shares) | 2,049,536 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,044,124 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,038,026 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,033,480 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,027,680 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,022,490 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,017,264 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 1,999,645 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,041,635 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,016,862 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 1,911,960 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in Shares) | 2,059,561 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,052,012 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,044,564 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,039,515 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,032,611 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,029,420 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,023,961 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,010,292 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,049,506 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,024,040 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 1,916,932 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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