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Note 12 - Stockholders' Equity (Details Textual)
12 Months Ended
Oct. 23, 2019
shares
Nov. 27, 2018
shares
Oct. 05, 2017
Oct. 02, 2017
shares
Jun. 12, 2015
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Jun. 13, 2016
shares
Increase (Decrease) in Common Stock Shares Authorized       (300,000,000) 100,000,000      
Common Stock, Shares Authorized       100,000,000 300,000,000 100,000,000 100,000,000 400,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance           314,218 234,218  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             0  
Share-based Payment Arrangement, Expense | $           $ 2,050,862 $ 142,017  
Share-based Payment Arrangement, Option [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance           154,005 74,004  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares           $ 10.73 $ 15.52  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term           8 years 29 days 7 years 281 days  
Plan 2013 [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 177,000 178,900            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 950,000 773,000            
Share-based Compensation Arrangement by Share-based Payment Award, Share Plan Authorized, Percent of Common Stock             20.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant           172,436 323,498  
Plan 2013 [Member] | Board of Directors [Member]                
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total | $           $ 60,000 $ 85,786  
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture           22,000    
Share-based Payment Arrangement, Expense | $           $ 138,000    
Plan 2013 [Member] | Executive Officer [Member]                
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total | $           $ 503,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           80,000    
Plan 2013 [Member] | Employees and Consultants [Member]                
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture           214,507    
Share-based Payment Arrangement, Expense | $           $ 1,349,000    
Reverse Stock Split [Member]                
Stockholders' Equity Note, Stock Split, Conversion Ratio     10