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Note 11 - Equity Plans (Details) - Stock Option Activity (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock Option Activity [Abstract]      
Outstanding, Number of Options 20,170us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 27,170us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Outstanding, Weighted Average Exercise Price $ 32.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 27.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Outstanding, Weighted Average Remaining Contractual Term 2 years 109 days    
Exercisable at December 31, 2014 20,170us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Exercisable at December 31, 2014 $ 32.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice    
Exercisable at December 31, 2014 2 years 109 days    
Exercised (7,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (11,667)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (4,168)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercised $ 12.32us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice