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Note 13 - Related Parties (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 963,814 265,124 412,208
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 $ 63,000 $ 196,000  
T3 Advisors [Member] | Real Estate Brokerage Services [Member]      
Related Party Transaction, Amounts of Transaction $ 192,000 $ 38,000