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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2020 19,055,000   (1,097,000)    
Balance at Dec. 31, 2020 $ 2,000 $ 70,070,000 $ (1,874,000) $ (65,015,000) $ 3,183,000
Restricted stock vested (in shares) 781,000        
Restricted stock vested     $ 0    
Treasury stock repurchased (in shares)     (327,000)   (327,563)
Treasury stock repurchased     $ (197,000)   $ (197,000)
Issuance of shares on option exercise (in shares) 450,000   0   450,000
Issuance of shares on option exercise $ 0 45,000 $ 0 0 $ 45,000
Stock-based compensation   469,000     469,000
Net loss for the year       (1,297,000) (1,297,000)
Balance (in shares) at Dec. 31, 2021 20,286,000   (1,424,000)    
Balance at Dec. 31, 2021 $ 2,000 70,584,000 $ (2,071,000) (66,312,000) $ 2,203,000
Restricted stock vested (in shares) 618,000        
Treasury stock repurchased (in shares)     (233,000)   (232,526)
Treasury stock repurchased     $ (134,000)   $ (134,000)
Issuance of shares on option exercise (in shares) 410,000   0   410,000
Issuance of shares on option exercise $ 0 41,000 $ 0 0 $ 41,000
Stock-based compensation   530,000     530,000
Net loss for the year       (73,000) (73,000)
Exercise of warrants (in shares) 1,883,000   0    
Exercise of warrants $ 0 367,000 $ 0 0 367,000
Balance (in shares) at Dec. 31, 2022 23,197,000   (1,657,000)    
Balance at Dec. 31, 2022 $ 2,000 $ 71,522,000 $ (2,205,000) $ (66,385,000) $ 2,934,000