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Equity - Stock Options - Valuation assumptions (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 28, 2021
Jan. 22, 2021
Jan. 31, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based compensation              
Exercise price (in dollars per share) $ 4.15 $ 3.97          
Equity Incentive Plan              
Share-based compensation              
Granted (in shares)           258,618  
Non-vested stock options              
Share-based compensation              
Contractual life           10 years  
Vesting period           2 years  
Fair value of options granted (in dollars)           $ 176,000  
Compensation expense       $ 0 $ 13,000 $ 13,000 $ 26,000
Non-vested stock options | Minimum [Member]              
Share-based compensation              
Exercise price (in dollars per share)           $ 1.16  
Non-vested stock options | Maximum [Member]              
Share-based compensation              
Exercise price (in dollars per share)           $ 2.25  
Non-vested stock options | Non-Qualified Stock Option [Member]              
Share-based compensation              
Granted (in shares)           341,382  
Stock options | Chief Executive Officer [Member] | Non-vested stock options              
Share-based compensation              
Granted (in shares)     600,000     600,000