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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, 2019 18,524,000   (962,000)    
Balance at Dec. 31, 2019 $ 2,000 $ 69,661,000 $ (1,700,000) $ (65,094,000) $ 2,869,000
Restricted stock vested (in shares) 407,000   0    
Restricted stock vested $ 0 0 $ 0 0 $ 0
Treasury stock repurchased (in shares) 0   (135,000)   (135,154)
Treasury stock repurchased $ 0 0 $ (174,000) 0 $ (174,000)
Issuance of shares on option exercise (in shares) 24,000   0   24,000
Issuance of shares on option exercise $ 0 2,000 $ 0 0 $ 2,000
Exercise of warrants (in shares) 100,000   0    
Exercise of warrants $ 0 15,000 $ 0 0 15,000
Stock-based compensation 0 392,000   0 392,000
Net income (loss) $ 0 0 $ 0 79,000 79,000
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   0    
Restricted stock vested $ 0 0 $ 0 0 $ 0
Treasury stock repurchased (in shares) 0   (327,000)   (327,563)
Treasury stock repurchased $ 0 0 $ (197,000) 0 $ (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 0 469,000 0 0 469,000
Net income (loss) $ 0 0 $ 0 (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