Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016	Mar. 31, 2017
Cumulative Preferred Stock [Member]
Preferred stock, dividend rate			6.00%
Preferred stock, par value (in dollars per share)	$ 0.25		$ 0.25
Cumulative Convertible Preferred Stock [Member]
Preferred stock, dividend rate			10.00%
Preferred stock, par value (in dollars per share)	0.25		$ 0.25
Participating Convertible Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	0.25		0.25
Series 2003 Convertible Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	0.25		0.25
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			$ 93
Change in pension, post retirement benefits, other adjustment, tax	$ (30)		$ (93)
Common Stock, Par Value (in dollars per share)	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.25