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Note 13 - Net Income Per Common Share (Details) - Net Income Per Common Share Calculation (USD $) In Thousands, except Per 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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Income Per Common Share Calculation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders (in Dollars) | $ 14,547 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 13,937 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 12,802 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 12,358 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 11,862 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 11,615 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 11,533 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 11,431 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 10,057 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 9,533 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 7,641 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 7,492 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | $ 53,644 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 46,441 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 34,723 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,684 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,726 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 23,136 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income per common share (in Dollars per share) | $ 0.51 us-gaap_EarningsPerShareBasic | [1] | $ 0.54 us-gaap_EarningsPerShareBasic | [1] | $ 0.49 us-gaap_EarningsPerShareBasic | [1] | $ 0.48 us-gaap_EarningsPerShareBasic | [1] | $ 0.46 us-gaap_EarningsPerShareBasic | [1],[2] | $ 0.45 us-gaap_EarningsPerShareBasic | [1],[2] | $ 0.45 us-gaap_EarningsPerShareBasic | [1],[2] | $ 0.45 us-gaap_EarningsPerShareBasic | [1],[2] | $ 0.40 us-gaap_EarningsPerShareBasic | [1],[2] | $ 0.41 us-gaap_EarningsPerShareBasic | [1],[2] | $ 0.34 us-gaap_EarningsPerShareBasic | [1],[2] | $ 0.34 us-gaap_EarningsPerShareBasic | [1],[2] | $ 2.01 us-gaap_EarningsPerShareBasic | $ 1.81 us-gaap_EarningsPerShareBasic | $ 1.50 us-gaap_EarningsPerShareBasic
Adjustment for common share equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 867 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 633 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 608 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Average common shares outstanding-diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,551 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 26,359 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 23,744 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income per common share (in Dollars per share) | $ 0.49 us-gaap_EarningsPerShareDiluted | [1] | $ 0.52 us-gaap_EarningsPerShareDiluted | [1] | $ 0.48 us-gaap_EarningsPerShareDiluted | [1] | $ 0.47 us-gaap_EarningsPerShareDiluted | [1] | $ 0.45 us-gaap_EarningsPerShareDiluted | [1],[2] | $ 0.44 us-gaap_EarningsPerShareDiluted | [1],[2] | $ 0.44 us-gaap_EarningsPerShareDiluted | [1],[2] | $ 0.44 us-gaap_EarningsPerShareDiluted | [1],[2] | $ 0.39 us-gaap_EarningsPerShareDiluted | [1],[2] | $ 0.40 us-gaap_EarningsPerShareDiluted | [1],[2] | $ 0.33 us-gaap_EarningsPerShareDiluted | [1],[2] | $ 0.33 us-gaap_EarningsPerShareDiluted | [1],[2] | $ 1.95 us-gaap_EarningsPerShareDiluted | $ 1.76 us-gaap_EarningsPerShareDiluted | $ 1.46 us-gaap_EarningsPerShareDiluted
Anti-dilutive shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 35,079 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 131,182 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
[1] | Earnings per common share are calculated on a quarterly basis and may not be additive to the year to date amount.
[2] | Per share amounts have been adjusted to give effect to the 10% common stock dividend paid on June 14, 2013.

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