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Stockholders' Equity - Restricted Stock (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
directors
shares
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
directors
$ / shares
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
$ / shares
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock issued for payment of services   $ 37,544 $ 31,249 $ 72,240 $ 62,499    
Number of independent directors | directors 5            
Fair value of common stock issued for future services       $ 147,329 125,000    
Common stock, par value (per share) | $ / shares   $ 0.0001   $ 0.0001   $ 0.0001  
Restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock, nonvested weighted average remaining contractual terms       8 months 12 days   1 year 4 months 24 days 1 year 10 months 24 days
Common stock, par value (per share) | $ / shares   $ 2.55   $ 2.55      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms 1       8 months      
Independent Directors [Member] | Restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock issued for payment of services (shares) | shares 390,625     30,324      
Stock issued for payment of services $ 125,000     $ 147,329      
Number of independent directors | directors       6      
Employees [Member] | Restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock or unit expense   $ 6,500 7,133 $ 13,007 20,668    
Non-Employees [Member] | Restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock or unit expense   37,544 $ 31,249 72,240 $ 62,499    
Equity Incentive 2011 Plan [Member] | Restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of common stock issued for future services       93,285      
Share-based compensation arrangement by share-based payment award, equity instruments other than options, aggregate intrinsic value, nonvested   $ 60,705   $ 60,705