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Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Common Stock    
Beginning balance, shares 58,108,366 58,133,066
Beginning balance, value $ 581 $ 581
Issuance of shares - ATM, net, shares 150,400  
Issuance of shares - ATM, net, value $ 2  
Issuance of shares - option exercises, shares 120,350  
Issuance of shares - option exercises, value $ 1  
Purchase of shares for cancellation, shares   (16,700)
Net loss
Ending balance, shares 58,379,116 58,116,366
Ending balance, value $ 584 $ 581
Additional Paid-In Capital    
Beginning balance, value 70,514 70,204
Stock option expense 28 85
Issuance of shares - ATM, net, value 96  
Issuance of shares - option exercises, value 66  
Purchase of shares for cancellation, value   (3)
Net loss
Ending balance, value 70,704 70,786
Accumulated Deficit    
Beginning balance, value (47,593) (46,654)
Net loss (528) (607)
Ending balance, value $ (48,121) $ (47,261)
Beginning balance, shares 58,108,366 58,133,066
Beginning balance, value $ 23,502 $ 24,131
Stock option expense $ 28 $ 85
Issuance of shares - ATM, net, shares 150,400  
Issuance of shares - ATM, net, value $ 98  
Issuance of shares - option exercises, shares 120,350  
Issuance of shares - option exercises, value $ 67  
Purchase of shares for cancellation, shares   (16,700)
Purchase of shares for cancellation, value   $ (3)
Net loss $ (528) $ (607)
Ending balance, shares 58,379,116 58,116,366
Ending balance, value $ 23,167 $ 23,606