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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended
Jun. 30, 2018
Apr. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Aug. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance       24,728,422     24,728,422   30,375,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period             5,306,883    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period             994,695    
Proceeds from Stock Options Exercised             $ 99,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross             655,000    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price             $ 1.31    
Allocated Share-based Compensation Expense, Total       $ 317,222 $ 10,600,000   $ 6,100,000 $ 15,700,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value       11,100,000     11,100,000    
Employee Stock Option [Member]                  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total       $ 1,200,000     $ 1,200,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition             1 year 36 days    
Equity Incentive Plan 2017 [Member] | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   5 years 273 days              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   62.00%              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   2.78%              
Mr. Monfort [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance       14,297,902     14,297,902    
Certain Non-Employees [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 499,123   297,694            
Stock Issued During Period, Value, Share-based Compensation, Forfeited     $ 423,308            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period           994,695      
Proceeds from Stock Options Exercised           $ 99,470      
One Non-employee [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Extended in Period 207,968                
Certain Employees and Directors [Member] | Equity Incentive Plan 2017 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   655,000              
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 1.31              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Market Value   $ 229,643              
Certain Employees and Directors [Member] | Equity Incentive Plan 2017 [Member] | Employee Stock Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years              
Certain Employees and Directors [Member] | Plan 2012 [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 3,450,000                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price $ 10.49