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Condensed Consolidated Statement of Stockholders' (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 29, 2018
Jun. 30, 2018
Sep. 29, 2018
Mar. 31, 2018
Preferred Stock [Member]        
Balance $ 707,000   $ 707,000 $ 707,000
Net earnings (loss)    
Cash dividends paid on preferred stock      
Equity incentive program    
Change in pension, post retirement benefits, other adjustment (net of tax)    
Preferred stock conversion      
Purchase treasury stock      
Common Stock [Member]        
Balance 3,038,000   3,038,000 3,038,000
Net earnings (loss)    
Cash dividends paid on preferred stock      
Equity incentive program    
Change in pension, post retirement benefits, other adjustment (net of tax)    
Preferred stock conversion      
Purchase treasury stock      
Additional Paid-in Capital [Member]        
Balance 98,211,000   98,211,000 98,161,000
Net earnings (loss)    
Cash dividends paid on preferred stock      
Equity incentive program 25,000 25,000    
Change in pension, post retirement benefits, other adjustment (net of tax)    
Preferred stock conversion      
Purchase treasury stock      
Treasury Stock [Member]        
Balance (71,135,000)   (71,135,000) (69,556,000)
Net earnings (loss)    
Cash dividends paid on preferred stock      
Equity incentive program    
Change in pension, post retirement benefits, other adjustment (net of tax)    
Preferred stock conversion      
Purchase treasury stock (1,579,000)      
AOCI Attributable to Parent [Member]        
Balance (25,169,000)   (25,169,000) (25,067,000)
Net earnings (loss)    
Cash dividends paid on preferred stock      
Equity incentive program    
Change in pension, post retirement benefits, other adjustment (net of tax) (51,000) (51,000)    
Preferred stock conversion      
Purchase treasury stock      
Retained Earnings [Member]        
Balance 404,129,000   $ 404,129,000 403,780,000
Net earnings (loss) 9,116,000 (8,755,000)    
Cash dividends paid on preferred stock   (12,000)    
Equity incentive program    
Change in pension, post retirement benefits, other adjustment (net of tax)    
Preferred stock conversion      
Purchase treasury stock      
Cumulative Preferred Stock [Member]        
Preferred stock, shares authorized (in shares) 200,000   200,000  
Preferred stock, shares outstanding (in shares) 200,000   200,000  
Cumulative Convertible Preferred Stock [Member]        
Preferred stock, shares authorized (in shares) 1,400,000   1,400,000  
Preferred stock, shares outstanding (in shares) 807,240   807,240  
Participating Convertible Preferred Stock [Member]        
Preferred stock, shares authorized (in shares) 37,529   37,529  
Preferred stock, shares outstanding (in shares) 37,529   37,529  
Series 2003 Convertible Preferred Stock [Member]        
Preferred stock, shares authorized (in shares) 500   500  
Preferred stock, shares outstanding (in shares) 500   500  
Common Class A [Member]        
Purchase treasury stock     $ (51,867)  
Common stock, shares authorized (in shares) 20,000,000   20,000,000  
Common stock, shares outstanding (in shares) 7,808,414   7,808,414  
Common Class B [Member]        
Common stock, shares authorized (in shares) 10,000,000   10,000,000  
Common stock, shares outstanding (in shares) 1,884,191   1,884,191  
Balance $ 409,781,000   $ 409,781,000 $ 411,063,000
Net earnings (loss) 9,116,000   361,000  
Change in pension, post retirement benefits, other adjustment (net of tax) $ 51,000   $ 102,000