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Note 14 - Subsequent Events (Details Textual) - USD ($)
1 Months Ended
Jan. 31, 2020
Feb. 16, 2018
Jan. 31, 2020
Mar. 02, 2020
Dec. 31, 2019
Feb. 14, 2018
Share Price         $ 1.14  
Proceeds from Issuance or Sale of Equity, Net   $ 15,500,000        
Debt Instrument, Covenant Compliance Target Minimum Revenue, Next Twelve Months       $ 10,000,000   $ 15,000,000
Debt Instrument, Covenant, Compliance Target Minimum Revenue Second Year       12,000,000   20,000,000
Debt Instrument, Covenant Compliance Target Minimum Revenue Third Year       15,000,000   $ 25,000,000
Subsequent Event [Member] | Loan Agreement [Member] | CRG [Member]            
Debt Instrument, Covenant Compliance Target Minimum Revenue, Next Twelve Months       10,000,000    
Debt Instrument, Covenant, Compliance Target Minimum Revenue Second Year       12,000,000    
Debt Instrument, Covenant Compliance Target Minimum Revenue Third Year       $ 15,000,000    
January 2020 Public Offering [Member] | Subsequent Event [Member]            
Stock Issued During Period, Shares, New Issues 6,428,572          
Share Price $ 0.70   $ 0.70      
Proceeds from Issuance or Sale of Equity, Net $ 3,700,000   $ 3,700,000