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Note 15 - Stock-Based Compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 15 - Stock-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 89,073    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years    
2008 Equity Incentive Plan [Member]      
Note 15 - Stock-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 250,000    
2010 Equity Incentive Plan [Member]      
Note 15 - Stock-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 350,000    
2013 Equity Incentive Plan [Member]      
Note 15 - Stock-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 350,000    
Employee Stock Purchase Plan [Member]      
Note 15 - Stock-Based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 230,040    
Maximum Amount Per Employee Per Offering Period for Employee Stock Purchase Plan (in Dollars) $ 7,500    
Maximum Amount Per Employee Per Offering Period for Employee Stock Purchase Plan Percent 8.00% 8.00% 8.00%