SEGMENT DATA (Reconciliation of Segment Operations) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Corporate and Other
Revenues	$ 26,411	$ 25,971	$ 20,586	$ 17,613	$ 21,629	$ 20,288	$ 17,560	$ 17,906	$ 90,581	$ 77,383	$ 124,383
Operating Income (Loss)									(10,824)	(15,985)	8,391
Operating Segments
Corporate and Other
Revenues									90,581	77,383	124,383
Operating Income (Loss)									(10,824)	(15,985)	8,391
Depreciation and Amortization									2,590	2,095	1,616
Capital Expenditures									837	586	498
Operating Segments | Lighting Segment
Corporate and Other
Revenues									61,102	56,553	118,557
Operating Income (Loss)									(1,352)	(5,150)	21,647
Depreciation and Amortization									747	1,094	1,255
Capital Expenditures									92	71	302
Operating Segments | Maintenance Segment
Corporate and Other
Revenues									17,147	14,555	5,826
Operating Income (Loss)									(5,523)	(2,221)	(337)
Depreciation and Amortization									453	317	132
Capital Expenditures									535	194	43
Operating Segments | EV Segment
Corporate and Other
Revenues									12,332	6,275	0
Operating Income (Loss)									(1,563)	(4,158)	0
Depreciation and Amortization									979	465	0
Capital Expenditures									56	5	0
Operating Segments | Corporate and Other
Corporate and Other
Revenues									0	0	0
Operating Income (Loss)									(2,386)	(4,456)	(13,593)
Depreciation and Amortization									411	219	229
Capital Expenditures									$ 154	$ 316	$ 153