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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Treasury Stock [Member]
Total
Balance (in shares) at Dec. 31, 2017 21,422,077          
Balance at Dec. 31, 2017 $ 214,000 $ 153,858,000 $ (111,591,000) $ (25,551,000) $ 0  
Net loss 0 0 (1,795,000) 0 0 $ (1,795,000)
Foreign currency translation adjustment 0 0 0 408,000 0  
Noncash compensation $ 0 143,000 0 0 0  
Retire treasury stock (in shares) (65,895)          
Retire treasury stock $ 0 0 0 0 0  
Balance (in shares) at Apr. 01, 2018 21,356,182          
Balance at Apr. 01, 2018 $ 214,000 154,001,000 (113,216,000) (25,143,000) 0  
Adoption of new accounting standards $ 0 0 170,000 0 0  
Balance (in shares) at Dec. 31, 2018 21,398,182          
Balance at Dec. 31, 2018 $ 214,000 154,388,000 (114,926,000) (24,842,000) 0 14,834,000
Net loss 0 0 (3,036,000) 0 0 (3,036,000)
Foreign currency translation adjustment 0 0 0 125,000 0  
Noncash compensation $ 0 111,000 0 0 0  
Retire treasury stock (in shares) (43,979)          
Retire treasury stock $ 0 (49,000) 0 0 0  
Balance (in shares) at Mar. 31, 2019 21,354,203          
Balance at Mar. 31, 2019 $ 214,000 154,450,000 (116,520,000) (24,717,000) 0 $ 13,427,000
Adoption of new accounting standards $ 0 $ 0 $ 1,442,000 $ 0 $ 0