Condensed Consolidated Statement of Stockholders' (Unaudited) - USD ($)	3 Months Ended			9 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Dec. 29, 2018	Mar. 31, 2018
Preferred Stock [Member]
Balance	$ 707,000			$ 707,000	$ 707,000
Net earnings
Cash dividends paid on preferred stock
Equity incentive program
Change in pension, post retirement benefits, other adjustment (net of tax)
Purchase treasury stock
Common Stock [Member]
Balance	3,038,000			3,038,000	3,038,000
Net earnings
Cash dividends paid on preferred stock
Equity incentive program
Change in pension, post retirement benefits, other adjustment (net of tax)
Purchase treasury stock
Additional Paid-in Capital [Member]
Balance	98,236,000			98,236,000	98,161,000
Net earnings
Cash dividends paid on preferred stock
Equity incentive program	25,000	25,000	25,000
Change in pension, post retirement benefits, other adjustment (net of tax)
Purchase treasury stock
Treasury Stock [Member]
Balance	(74,896,000)			(74,896,000)	(69,556,000)
Net earnings
Cash dividends paid on preferred stock
Equity incentive program
Change in pension, post retirement benefits, other adjustment (net of tax)
Purchase treasury stock	(3,761,000)	(1,579,000)
AOCI Attributable to Parent [Member]
Balance	(25,186,000)			(25,186,000)	(25,067,000)
Net earnings
Cash dividends paid on preferred stock
Equity incentive program
Change in pension, post retirement benefits, other adjustment (net of tax)	(17,000)	(51,000)	(51,000)
Purchase treasury stock
Retained Earnings [Member]
Balance	418,134,000			$ 418,134,000	403,780,000
Net earnings	14,016,000	9,116,000	(8,755,000)
Cash dividends paid on preferred stock	(11,000)		(12,000)
Equity incentive program
Change in pension, post retirement benefits, other adjustment (net of tax)
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				$ (160,179)
Common stock, shares authorized (in shares)	20,000,000			20,000,000
Common stock, shares outstanding (in shares)	7,700,102			7,700,102
Common Class B [Member]
Purchase treasury stock				$ (9,290)
Common stock, shares authorized (in shares)	10,000,000			10,000,000
Common stock, shares outstanding (in shares)	1,874,901			1,874,901
Balance	$ 420,033,000			$ 420,033,000	$ 411,063,000
Net earnings	14,016,000			14,377,000
Change in pension, post retirement benefits, other adjustment (net of tax)	$ 17,000			$ 119,000