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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
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) $ 14,547us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 13,937us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 12,802us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 12,358us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 11,862us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 11,615us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 11,533us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 11,431us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 10,057us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 9,533us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 7,641us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 7,492us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 53,644us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 46,441us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 34,723us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Average common shares outstanding                         26,684us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 25,726us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 23,136us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income per common share (in Dollars per share) $ 0.51us-gaap_EarningsPerShareBasic [1] $ 0.54us-gaap_EarningsPerShareBasic [1] $ 0.49us-gaap_EarningsPerShareBasic [1] $ 0.48us-gaap_EarningsPerShareBasic [1] $ 0.46us-gaap_EarningsPerShareBasic [1],[2] $ 0.45us-gaap_EarningsPerShareBasic [1],[2] $ 0.45us-gaap_EarningsPerShareBasic [1],[2] $ 0.45us-gaap_EarningsPerShareBasic [1],[2] $ 0.40us-gaap_EarningsPerShareBasic [1],[2] $ 0.41us-gaap_EarningsPerShareBasic [1],[2] $ 0.34us-gaap_EarningsPerShareBasic [1],[2] $ 0.34us-gaap_EarningsPerShareBasic [1],[2] $ 2.01us-gaap_EarningsPerShareBasic $ 1.81us-gaap_EarningsPerShareBasic $ 1.50us-gaap_EarningsPerShareBasic
Adjustment for common share equivalents                         867us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 633us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 608us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Average common shares outstanding-diluted                         27,551us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 26,359us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 23,744us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income per common share (in Dollars per share) $ 0.49us-gaap_EarningsPerShareDiluted [1] $ 0.52us-gaap_EarningsPerShareDiluted [1] $ 0.48us-gaap_EarningsPerShareDiluted [1] $ 0.47us-gaap_EarningsPerShareDiluted [1] $ 0.45us-gaap_EarningsPerShareDiluted [1],[2] $ 0.44us-gaap_EarningsPerShareDiluted [1],[2] $ 0.44us-gaap_EarningsPerShareDiluted [1],[2] $ 0.44us-gaap_EarningsPerShareDiluted [1],[2] $ 0.39us-gaap_EarningsPerShareDiluted [1],[2] $ 0.40us-gaap_EarningsPerShareDiluted [1],[2] $ 0.33us-gaap_EarningsPerShareDiluted [1],[2] $ 0.33us-gaap_EarningsPerShareDiluted [1],[2] $ 1.95us-gaap_EarningsPerShareDiluted $ 1.76us-gaap_EarningsPerShareDiluted $ 1.46us-gaap_EarningsPerShareDiluted
Anti-dilutive shares                         13,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 35,079us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 131,182us-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.