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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
Common Stock Outstanding [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Treasury Stock [Member]
Total
Balance (in shares) at Dec. 31, 2020 21,300,958          
Balance at Dec. 31, 2020 $ 213,000 $ 155,025,000 $ (115,765,000) $ (24,698,000) $ 0  
Net income (loss) 0 0 (1,630) 0 0 $ (1,630,000)
Foreign currency translation adjustment $ 0 0 0 (406,000) 0  
Exercise of stock options (in shares) 136,005          
Exercise of stock options $ 1,000 (303,000) 0 0 0  
Noncash compensation (in shares) 0          
Noncash compensation $ 0 61,000 0 0 0  
Balance (in shares) at Apr. 04, 2021 21,436,963          
Balance at Apr. 04, 2021 $ 214,000 154,783,000 (117,395,000) (25,104,000) 0  
Balance (in shares) at Dec. 31, 2021 21,864,724          
Balance at Dec. 31, 2021 $ 218,000 154,904,000 (112,842,000) (22,994,000) 0 19,286,000
Net income (loss) 0 0 237,000 0 0 237,000
Foreign currency translation adjustment $ 0 0 0 583,000 0  
Exercise of stock options (in shares) 11,120          
Exercise of stock options $ 0 (17,000) 0 0 0  
Noncash compensation (in shares) 15,000          
Noncash compensation $ 0 176,000 0 0 0  
Issuance of restricted common stock (in shares) 197,500          
Issuance of restricted common stock $ 2,000 (2,000) 0 0 0  
Balance (in shares) at Apr. 03, 2022 22,088,344          
Balance at Apr. 03, 2022 $ 220,000 $ 155,061,000 $ (112,605,000) $ (22,411,000) $ 0 $ 20,265,000