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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Income tax benefit $ 17,000 $ 16,000 $ 34,000 $ 33,000        
Common stock, shares outstanding (in shares) 8,415,476   8,415,476     8,235,740    
Stockholders' Equity Attributable to Parent $ 106,622,000 102,103,000 $ 106,622,000 102,103,000 $ 104,397,000 $ 100,095,000 $ 97,595,000 $ 93,932,000
Net Income (Loss) Attributable to Parent 2,188,000 4,086,000 6,052,000 7,542,000        
Change in post retirement benefits, net of tax (63,000) (64,000) (127,000) (128,000)        
Restricted stock vested 1,000 0 2,000 0        
Share-based compensation $ 581,000 $ 486,000 $ 1,082,000 804,000        
Treasury Stock                
Restricted stock vested (in shares) (48,286) 52,948 (48,286)          
Purchase of treasury stock $ (482,000) $ (47,000) $ (482,000)          
Stockholders' Equity Attributable to Parent $ (29,099,000) $ (28,568,000) $ (29,099,000) $ (28,568,000) $ (28,617,000) $ (28,617,000) $ (28,568,000) $ (28,521,000)
Common Stock [Member]                
Restricted stock vested (in shares) 193,600   228,022 64,106        
Common stock, shares outstanding (in shares) 8,415,476 8,040,748 8,415,476 8,040,748 8,270,162 8,235,740 7,987,800 7,980,516
Stockholders' Equity Attributable to Parent $ 84,000 $ 80,000 $ 84,000 $ 80,000 $ 83,000 $ 82,000 $ 80,000 $ 80,000
Restricted stock vested 1,000 0 2,000 0        
Paid-In Capital                
Stockholders' Equity Attributable to Parent 39,095,000 36,931,000 39,095,000 36,931,000 38,514,000 38,013,000 36,445,000 36,127,000
Share-based compensation 581,000 486,000 1,082,000 804,000        
Accumulated Other Comprehensive Income                
Stockholders' Equity Attributable to Parent 948,000 1,247,000 948,000 1,247,000 1,011,000 1,075,000 1,311,000 1,375,000
Change in post retirement benefits, net of tax (63,000) (64,000) (127,000) (128,000)        
Retained Earnings                
Stockholders' Equity Attributable to Parent 95,594,000 92,413,000 95,594,000 92,413,000 $ 93,406,000 $ 89,542,000 $ 88,327,000 $ 84,871,000
Net Income (Loss) Attributable to Parent $ 2,188,000 $ 4,086,000 $ 6,052,000 $ 7,542,000