Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Apr. 01, 2019	Mar. 31, 2019
Summary Of Significant Accounting Policies [Line Items]
Gross patent costs							$ 572,000
Accumulated amortization							388,000
Transfer to Investments			$ 14,000
Contribution of patent to TeamConnect LLC			34,000
Amortization expense			10,000	$ 10,000
Impairment of long-lived assets	$ 33,000	$ 200,000	33,000	$ 730,000
Asset retirement obligation	$ 831,000		$ 831,000				328,000
Wireless licenses term			10 years
Lease term	10 years		10 years
Tax benefits attributed to share-based compensation expense			$ 0
Potentially dilutive securities outstanding but excluded from computation of earnings per share			1,396,000	1,386,000
Right of use assets, net	$ 6,841,000		$ 6,841,000			$ 7,100,000
Lease liability	$ 9,148,000		$ 9,148,000			9,400,000
Deferred rent liability						$ 2,300,000
Weighted average incremental borrowing rate	13.00%		13.00%			13.00%
Accounts payable and accrued expenses							200,000
Non-current other liabilities							$ 2,100,000
Property, Plant and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets			$ 22,000
Right Of Use Asset [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment of long-lived assets	$ 11,000		$ 11,000
Accounting Standards Update 2018-07 [Member]
Summary Of Significant Accounting Policies [Line Items]
Decrease to accumulated deficit						$ 188,000
TeamConnect LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage	19.50%		19.50%		19.50%
Transfer to Investments	$ 174,000		$ 174,000
Contribution of patent to TeamConnect LLC			$ 34,000