SEGMENT INFORMATION - RECONCILIATION OF OPERATING PROFIT (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 13,744	$ 16,278	$ 26,822	$ 31,518
Direct operating (excludes depreciation and amortization shown below)	3,616	4,041	7,041	8,107
Selling, general and administrative	6,487	6,247	13,030	12,565
Allocation of corporate overhead	0	0	0	0
Provision for doubtful accounts	1,067	949	1,132	949
Depreciation and amortization of property and equipment	2,076	3,645	4,165	8,002
Amortization of intangible assets	1,395	1,395	2,790	2,790
Total operating expenses	14,641	16,277	28,158	32,413
Income (loss) from operations	(897)	1	(1,336)	(895)
Cinema Equipment Business
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	7,491	10,025	14,606	19,813
Direct operating (excludes depreciation and amortization shown below)	410	352	722	751
Selling, general and administrative	465	428	998	870
Allocation of corporate overhead	390	410	789	800
Provision for doubtful accounts	1,067	949	1,243	949
Depreciation and amortization of property and equipment	1,942	3,476	3,902	7,677
Amortization of intangible assets	11	12	23	23
Total operating expenses	4,285	5,627	7,677	11,070
Income (loss) from operations	3,206	4,398	6,929	8,743
Content & Entertainment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	6,253	6,253	12,216	11,705
Direct operating (excludes depreciation and amortization shown below)	3,206	3,689	6,319	7,356
Selling, general and administrative	3,833	3,903	7,720	7,884
Allocation of corporate overhead	1,015	872	2,053	1,701
Provision for doubtful accounts	0	0	(111)	0
Depreciation and amortization of property and equipment	87	82	169	151
Amortization of intangible assets	1,382	1,381	2,764	2,763
Total operating expenses	9,523	9,927	18,914	19,855
Income (loss) from operations	(3,270)	(3,674)	(6,698)	(8,150)
Corporate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	0	0	0	0
Direct operating (excludes depreciation and amortization shown below)	0	0	0	0
Selling, general and administrative	2,189	1,916	4,312	3,811
Allocation of corporate overhead	(1,405)	(1,282)	(2,842)	(2,501)
Provision for doubtful accounts	0	0	0	0
Depreciation and amortization of property and equipment	47	87	94	174
Amortization of intangible assets	2	2	3	4
Total operating expenses	833	723	1,567	1,488
Income (loss) from operations	$ (833)	$ (723)	$ (1,567)	$ (1,488)