SEGMENT INFORMATION - ASSETS and DEBT (Details)	3 Months Ended
	Jun. 30, 2019 USD ($) segments systems	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)
Segment Reporting, Asset Reconciling Item [Line Items]
Number of reportable segments | segments	2
Total intangible assets, net	$ 8,691,000	$ 9,686,000
Total goodwill	8,701,000	8,701,000	$ 8,701,000
Assets from continuing operations	98,202,000	101,883,000
Notes payable, non-recourse	14,857,000	19,132,000
Current portion of notes payable	43,017,000	43,319,000
Present value of lease liabilities	2,259,000	0
Cinema Equipment Business | Segment, Continuing Operations
Segment Reporting, Asset Reconciling Item [Line Items]
Total intangible assets, net	57,000	69,000
Total goodwill	0	0
Assets from continuing operations	41,439,000	42,958,000
Notes payable, non-recourse	14,857,000	19,132,000
Current portion of notes payable	0	0
Present value of lease liabilities	924,000	0
Content & Entertainment | Segment, Continuing Operations
Segment Reporting, Asset Reconciling Item [Line Items]
Total intangible assets, net	8,625,000	9,607,000
Total goodwill	8,701,000	8,701,000
Assets from continuing operations	52,205,000	54,575,000
Notes payable, non-recourse	0	0
Current portion of notes payable	0	0
Present value of lease liabilities	424,000	0
Corporate | Segment, Continuing Operations
Segment Reporting, Asset Reconciling Item [Line Items]
Total intangible assets, net	9,000	10,000
Total goodwill	0	0
Assets from continuing operations	4,558,000	4,350,000
Notes payable, non-recourse	0	0
Current portion of notes payable	43,017,000	43,319,000
Present value of lease liabilities	$ 911,000	$ 0
Phase I Deployment
Segment Reporting, Asset Reconciling Item [Line Items]
Number of systems installed | systems	3,445
Phase II Deployment
Segment Reporting, Asset Reconciling Item [Line Items]
Number of systems installed | systems	5,497
Number of Systems Installed with No Residual Cash Flow Ownership | systems	8,904