Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016	Mar. 31, 2017
Cumulative Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.25		$ 0.25
Preferred stock, dividend rate			6.00%
Cumulative Convertible Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	0.025		$ 0.025
Preferred stock, dividend rate			10.00%
Participating Convertible Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	0.025		$ 0.025
Series 2003 Convertible Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	0.025		0.025
Common Class A [Member]
Common Stock, Par Value (in dollars per share)	0.25		0.25
Common Class B [Member]
Common Stock, Par Value (in dollars per share)	$ 0.25		$ 0.25
AOCI Attributable to Parent [Member]
Change in pension, post retirement benefits, other adjustment, tax			$ 63
Change in pension, post retirement benefits, other adjustment, tax	$ 26		$ 63
Common Stock, Par Value (in dollars per share)	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.25