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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Income tax benefit $ 17,000 $ 18,000 $ 51,000 $ 51,000          
Common stock, shares outstanding (in shares) 8,413,655   8,413,655       8,235,740    
Stockholders' Equity Attributable to Parent $ 108,672,000 99,292,000 $ 108,672,000 99,292,000   $ 106,622,000 $ 100,095,000 $ 102,103,000 $ 93,932,000
Net Income (Loss) Attributable to Parent 1,319,000 (3,312,000) 7,371,000 4,230,000          
Change in post retirement benefits, net of tax (64,000) (63,000) (191,000) (191,000)          
Gain (loss) on derivatives (467,000)   (467,000)            
Restricted stock vested   1,000 2,000 1,000          
Share-based compensation 623,000 612,000 1,705,000 1,416,000          
Interest rate swaps:                  
Income tax benefit (166,000) 0 (166,000)   $ 0        
Foreign currency hedging derivatives:                  
Income tax benefit 159,000 $ 0 $ 159,000   $ 0        
Treasury Stock                  
Restricted stock vested (in shares)   45,894 (48,286)            
Purchase of treasury stock   $ (49,000) $ (482,000) (96,000)          
Stockholders' Equity Attributable to Parent $ (29,099,000) $ (28,617,000) $ (29,099,000) $ (28,617,000)   $ (29,099,000) $ (28,617,000) $ (28,568,000) $ (28,521,000)
Common Stock [Member]                  
Restricted stock vested (in shares)     226,201 110,000          
Common stock, shares outstanding (in shares) 8,413,655 8,083,279 8,413,655 8,083,279   8,413,655 8,235,740 8,040,748 7,980,516
Stockholders' Equity Attributable to Parent $ 84,000 $ 81,000 $ 84,000 $ 81,000   $ 84,000 $ 82,000 $ 80,000 $ 80,000
Restricted stock vested   1,000 2,000 1,000          
Paid-In Capital                  
Stockholders' Equity Attributable to Parent 39,718,000 37,543,000 39,718,000 37,543,000   39,095,000 38,013,000 36,931,000 36,127,000
Share-based compensation 623,000 612,000 1,705,000 1,416,000          
Accumulated Other Comprehensive Income                  
Stockholders' Equity Attributable to Parent 1,056,000 1,184,000 1,056,000 1,184,000   948,000 1,075,000 1,247,000 1,375,000
Change in post retirement benefits, net of tax (64,000) (63,000) (191,000) (191,000)          
Gain (loss) on derivatives (467,000)   (467,000)            
Retained Earnings                  
Stockholders' Equity Attributable to Parent 96,913,000 89,101,000 96,913,000 89,101,000   $ 95,594,000 $ 89,542,000 $ 92,413,000 $ 84,871,000
Net Income (Loss) Attributable to Parent $ 1,319,000 $ (3,312,000) $ 7,371,000 $ 4,230,000