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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
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, 2019 21,298,426          
Balance at Dec. 31, 2019 $ 213 $ 154,702 $ (117,433) $ (24,051) $ 0  
Net income (loss) 0 0 (653) 0 0 $ (653)
Foreign currency translation adjustment $ 0 0 0 (1,481) 0  
Exercise of stock options (in shares) 11,154          
Exercise of stock options $ 0 (7) 0 0 0  
Noncash compensation (in shares) 60,000          
Noncash compensation $ 0 228 0 0 0  
Retire treasury stock (in shares) 0          
Retire treasury stock $ 0 0 0 0 0  
Balance (in shares) at Jul. 05, 2020 21,369,580          
Balance at Jul. 05, 2020 $ 213 154,923 (118,086) (25,532) 0  
Balance (in shares) at Apr. 05, 2020 21,309,580          
Balance at Apr. 05, 2020 $ 213 154,789 (117,738) (25,957) 0  
Net income (loss) 0 0 (348) 0 0 (348)
Foreign currency translation adjustment $ 0 0 0 425 0  
Noncash compensation (in shares) 60,000          
Noncash compensation $ 0 134 0 0 0  
Retire treasury stock (in shares) 0          
Retire treasury stock $ 0 0 0 0 0  
Balance (in shares) at Jul. 05, 2020 21,369,580          
Balance at Jul. 05, 2020 $ 213 154,923 (118,086) (25,532) 0  
Balance (in shares) at Dec. 31, 2020 21,300,958          
Balance at Dec. 31, 2020 $ 213 155,025 (115,765) (24,698) 0 14,775
Net income (loss) 0 0 2,193 0 0 2,193
Foreign currency translation adjustment $ 0 0 0 (51) 0  
Exercise of stock options (in shares) 196,487          
Exercise of stock options $ 2 (384) 0 0 0  
Noncash compensation (in shares) 17,500          
Noncash compensation $ 0 163 0 0 0  
Retire treasury stock (in shares) 0          
Retire treasury stock $ 0 0 0 0 0  
Balance (in shares) at Jul. 04, 2021 21,514,945          
Balance at Jul. 04, 2021 $ 215 154,804 (113,572) (24,749) 0 16,698
Balance (in shares) at Apr. 04, 2021 21,436,963          
Balance at Apr. 04, 2021 $ 214 154,783 (117,395) (25,104) 0  
Net income (loss) 0 0 3,823 0 0 3,823
Foreign currency translation adjustment $ 0 0 0 355 0  
Exercise of stock options (in shares) 60,482          
Exercise of stock options $ 1 (81) 0 0 0  
Noncash compensation (in shares) 17,500          
Noncash compensation $ 0 102 0 0 0  
Retire treasury stock (in shares) 0          
Retire treasury stock $ 0 0 0 0 0  
Balance (in shares) at Jul. 04, 2021 21,514,945          
Balance at Jul. 04, 2021 $ 215 $ 154,804 $ (113,572) $ (24,749) $ 0 $ 16,698