SEGMENT INFORMATION - EMPLOYEE STOCK-BASED COMPENSATION EXPENSE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	$ 317	$ 330	$ 403	$ 647
Direct operating
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	0	13	0	13
Selling, general and administrative
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	317	317	403	634
Cinema Equipment Business
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	5	12	5	12
Cinema Equipment Business | Direct operating
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	0	8	0	8
Cinema Equipment Business | Selling, general and administrative
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	5	4	5	4
Content & Entertainment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	65	228	65	228
Content & Entertainment | Direct operating
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	0	5	0	5
Content & Entertainment | Selling, general and administrative
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	65	223	65	223
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	247	90	333	407
Corporate | Direct operating
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	0	0	0	0
Corporate | Selling, general and administrative
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total stock-based compensation	$ 247	$ 90	$ 333	$ 407