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A summary of stock option activity for the years ended December 31, 2021 and 2020, and changes during the years then ended is presented below: (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]    
Outstanding at beginning of period 440,400 379,800
Outstanding at beginning of period $ 6.58 $ 7.54
Outstanding at beginning of period 5 years 9 months 18 days 6 years 1 month 6 days
Outstanding at beginning of period $ 155
Granted 236,667 70,000
Granted $ 3.31 $ 1.68
Exercised (26,000)
Exercised $ 1.10
Forfeited (3,400) (9,400)
Forfeited $ 12.00 $ 8.55
Outstanding at end of period 647,667 440,400
Outstanding at end of period $ 5.53 $ 6.58
Outstanding at end of period 6 years 4 months 24 days  
Outstanding at end of period $ 1,442 $ 155
Exercisable at end of period 411,000  
Exercisable at end of period $ 6.81  
Exercisable at end of period 4 years 9 months 18 days  
Exercisable at end of period $ 451