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Note 1 - Nature of Operations and Basis of Presentation - Summary of Stock Option Transactions for Common Stock (Details) (USD $)
 9 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Outstanding stock options as of February 28: (in shares) 155,880us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 270,945us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercised (in shares) (142,944)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (2,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Cancelled/forfeited (in shares)   (88,725)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Outstanding stock options as of November 30: (in shares) 12,936us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 180,220us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Weighted average exercise price (in dollars per share) $ 14.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 7.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted average remaining contractual term (in years) 1 year 105 days 244 days