CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Revenue, Net [Abstract]
Service revenue	$ 8,601,000		$ 25,159,000
Revenue, equipment sales, net	1,589,000	$ 1,262,000	4,180,000	$ 3,443,000
Revenue, equipment rentals, net	1,313,000	1,047,000	3,778,000	2,912,000
Net operating revenues	8,601,000	8,239,000	25,159,000	24,323,000
Net operating expenses
Cost of Services (exclusive of depreciation and amortization included below)	1,648,000	1,733,000	5,019,000	5,140,000
Cost of equipment sales	1,734,000	1,673,000	4,521,000	4,622,000
Cost of equipment rentals	182,000	123,000	457,000	347,000
Selling, general and administrative	2,003,000	2,108,000	5,731,000	6,059,000
Severance and exit costs	(30,000)		(63,000)	(13,000)
Depreciation, network and other	1,088,000	987,000	3,132,000	2,961,000
Depreciation, equipment rentals	1,137,000	990,000	3,454,000	2,732,000
Amortization	145,000	196,000	475,000	628,000
Other, net	185,000	(298,000)	298,000	(657,000)
Total costs and expenses	8,122,000	7,512,000	23,087,000	21,832,000
Operating Income	479,000	727,000	2,072,000	2,491,000
Other (expense) income
Interest Expense	(664,000)	(581,000)	(1,934,000)	(1,789,000)
Other income, net	32,000	(42,000)	153,000	(50,000)
Nonoperating Expense	(632,000)	(623,000)	(1,781,000)	(1,839,000)
Loss (income) before income taxes	(153,000)	104,000	291,000	652,000
Income tax benefit	8,000	7,052,000	(56,000)	6,662,000
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(145,000)	7,156,000	235,000	7,314,000
Net Income (Loss) Attributable to Noncontrolling Interest	4,000	6,000	(4,000)	6,000
Net Income (Loss) Attributable to Parent	$ (141,000)	$ 7,162,000	$ 231,000	$ 7,320,000
Basic net (loss) income per common share	$ (0.03)	$ 1.79	$ 0.06	$ 1.83
Diluted net (loss) income per common share	$ (0.03)	$ 1.76	$ 0.06	$ 1.79
Basic weighted average common shares outstanding	4,078	4,001	4,050	3,998
Diluted weighted average common shares outstanding	4,078	4,061	4,110	4,080
Other comprehensive (loss) income, net of tax:
Net unrealized holding gains on securities and other	$ (2,000)	$ 7,000	$ (9,000)	$ 25,000
Net unrealized holding gains (losses) on derivatives	(25,000)	19,000	(8,000)	12,000
Net unrecognized net periodic pension and other postretirement benefits	2,000	0	5,000	1,000
Cumulative Effect of New Accounting Pronouncement	0		(8,000)
Other comprehensive income	(25,000)	26,000	(20,000)	38,000
Comprehensive (loss) income	(170,000)	7,182,000	215,000	7,352,000
Services [Member]
Revenue, Net [Abstract]
Service revenue	$ 5,699,000	$ 5,930,000	$ 17,201,000	$ 17,968,000