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Note 11 - Related Parties (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 480,191 203,104 360,563
Director [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 6,500    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value $ 87,100    
Director [Member] | Restricted Stock Units (RSUs) [Member] | Vesting Commencing on August 15, 2016 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.33%    
Director [Member] | Product Development, Clinical Sales and Marketing Support Services [Member]      
Related Party Transaction, Amounts of Transaction $ 182,100