Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 6 months ended Sep. 30, 2017 - USD ($)	Cumulative Preferred Stock [Member]	Cumulative Convertible Preferred Stock [Member]	Participating Convertible Preferred Stock [Member]	Series 2003 Convertible Preferred Stock [Member]	Common Class A [Member]	Common Class B [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance at Mar. 31, 2017							$ 1,324,000	$ 3,024,000	$ 97,458,000	$ (66,499,000)	$ (11,175,000)	$ 410,129,000	$ 434,261,000
Net loss												(1,951,000)	(1,951,000)
Cash dividends paid on preferred stock												(12,000)	(12,000)
Equity incentive program									50,000
Preferred stock conversion							(605,000)	14,000	591,000
Purchase treasury stock					$ 2,689,000	$ 7,000				(2,696,000)
Change in pension, post retirement benefits, other adjustment (net of tax of $63)											102,000		(102,000)
Balance at Sep. 30, 2017							$ 719,000	$ 3,038,000	$ 98,099,000	$ (69,195,000)	$ (11,073,000)	$ 408,166,000	$ 429,754,000
Preferred stock, shares authorized (in shares)	200,000	1,400,000	38,542	500
Common stock, shares authorized (in shares)					20,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	200,000	807,240	38,542	500
Common stock, shares outstanding (in shares)					7,875,188	1,884,439