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Stockholders' Equity - Stock Options (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Aug. 22, 2011
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option plan expense   $ 59,051   $ 90,000  
Common stock, par value (per share)   $ 0.0001   $ 0.0001  
Percentage of individual ownership of common stock (percentage) 10.00%        
Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value   $ 0      
Equity Incentive 2011 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, par value (per share)   $ 0.20      
Common shares outstanding   1,346,355   1,357,837 1,040,477
Weighted average remaining life (years), outstanding   7 years 4 days   7 years 2 months 23 days 6 years 6 months
Common shares expected to vest   795,928      
Common shares expected to vest weighted average   $ 4.64      
Common shares, exercised   0 0    
Share-based compensation arrangement by share-based payment award, options, exercisable, intrinsic value   $ 0      
Weighted average remaining years to vest (in years)   2 years 9 months 15 days   2 years 11 months 27 days 2 years 5 months
May 2011 and August 2011 Equity Incentive Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair Market Value of Incentive Stock Options 100.00%        
Share-based Payment Arrangement, Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized   $ 285,236      
Individual Stock Ownership in Excess of 10 Percent [Member] | May 2011 and August 2011 Equity Incentive Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair Market Value of Incentive Stock Options 110.00%        
Total vesting period [Member] | Share-based Payment Arrangement, Option [Member] | May 2011 and August 2011 Equity Incentive Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, award vesting period (in years) 10 years        
Twelve Months After Grant Date [Member] | May 2011 and August 2011 Equity Incentive Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of individual ownership of common stock (percentage) 25.00%        
Stock option vesting period from grant date (in years) 1 year        
Monthly in equal installments [Member] | Share-based Payment Arrangement, Option [Member] | May 2011 and August 2011 Equity Incentive Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, award vesting period (in years) 3 years