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Note 7 - 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
Mar. 31, 2015
Mar. 31, 2014
Net Income Per Common Share Calculation [Abstract]    
Net income available to common shareholders (in Dollars) $ 19,238us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 12,358us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Average common shares outstanding 31,083us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 25,928us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income per common share (in Dollars per share) $ 0.62us-gaap_EarningsPerShareBasic $ 0.48us-gaap_EarningsPerShareBasic
Adjustment for common share equivalents 693us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 647us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Average common shares outstanding-diluted 31,776us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 26,575us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income per common share (in Dollars per share) $ 0.61us-gaap_EarningsPerShareDiluted $ 0.47us-gaap_EarningsPerShareDiluted
Anti-dilutive shares 13,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 21,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount