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Note 10 - Stock-based Compensation Plans and Warrants (Details) - Fair Value Assumptions for Stock Options
12 Months Ended
Dec. 31, 2014
Fair Value Assumptions for Stock Options [Abstract]  
Risk-free interest rate 3.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Expected life (years) 9 years 146 days
Expected volatility 52.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Expected dividend yield 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate