SEGMENT INFORMATION - ASSETS and DEBT (Details)	9 Months Ended
	Dec. 31, 2019 USD ($) segments systems	Mar. 31, 2019 USD ($)
Segment Reporting, Asset Reconciling Item [Line Items]
Number of reportable segments | segments	2
Total intangible assets, net	$ 7,518,000	$ 9,686,000
Total goodwill	8,701,000	8,701,000
Assets from continuing operations	95,711,000	98,839,000
Notes payable, non-recourse	11,604,000	19,132,000
Current portion of notes payable	38,310,000	43,319,000
Present value of lease liabilities	1,844,000	0
Cinema Equipment Business | Segment, Continuing Operations
Segment Reporting, Asset Reconciling Item [Line Items]
Total intangible assets, net	34,000	69,000
Total goodwill	0	0
Assets from continuing operations	37,939,000	42,958,000
Notes payable, non-recourse	11,604,000	19,132,000
Current portion of notes payable	0	0
Present value of lease liabilities	927,000	0
Content & Entertainment | Segment, Continuing Operations
Segment Reporting, Asset Reconciling Item [Line Items]
Total intangible assets, net	7,477,000	9,607,000
Total goodwill	8,701,000	8,701,000
Assets from continuing operations	54,987,000	51,531,000
Notes payable, non-recourse	0	0
Current portion of notes payable	0	0
Present value of lease liabilities	189,000	0
Corporate | Segment, Continuing Operations
Segment Reporting, Asset Reconciling Item [Line Items]
Total intangible assets, net	7,000	10,000
Total goodwill	0	0
Assets from continuing operations	2,785,000	4,350,000
Notes payable, non-recourse	0	0
Current portion of notes payable	38,310,000	43,319,000
Present value of lease liabilities	$ 728,000	$ 0
Phase I Deployment
Segment Reporting, Asset Reconciling Item [Line Items]
Number of systems installed | systems	3,367
Phase II Deployment
Segment Reporting, Asset Reconciling Item [Line Items]
Number of systems installed | systems	4,976
Number of Systems Installed with No Residual Cash Flow Ownership | systems	8,904