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Note 4 - Equity Incentive Plan (Details) - Assumptions Used to Estimate Fair Value of Stock Options and Stock Appreciation Rights Awards
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Note 4 - Equity Incentive Plan (Details) - Assumptions Used to Estimate Fair Value of Stock Options and Stock Appreciation Rights Awards [Line Items]        
Risk free interest rate   0.65%    
Expected volatility 53.28% 57.60% 53.28% 57.60%
Expected lives (years) 4 years 4 years 4 years 4 years
Expected dividend yield 0.00% 0.00% 0.00% 0.00%
Minimum [Member]
       
Note 4 - Equity Incentive Plan (Details) - Assumptions Used to Estimate Fair Value of Stock Options and Stock Appreciation Rights Awards [Line Items]        
Risk free interest rate 1.16%   1.16% 0.61%
Maximum [Member]
       
Note 4 - Equity Incentive Plan (Details) - Assumptions Used to Estimate Fair Value of Stock Options and Stock Appreciation Rights Awards [Line Items]        
Risk free interest rate 1.30%   1.33% 0.70%