Revenue Recognition - Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Revenue, net:
Total revenue, net	$ 14,600	$ 21,011	$ 66,871	$ 59,900
Product [Member]
Revenue, net:
Total revenue, net	5,165	11,143	33,464	30,535
Microturbine Products
Revenue, net:
Total revenue, net	5,078	10,027	32,553	28,775
Accessories
Revenue, net:
Total revenue, net	87	1,116	911	1,760
Service [Member]
Revenue, net:
Total revenue, net	6,603	7,500	23,906	23,940
Rentals
Revenue, net:
Total revenue, net	2,832	2,368	9,501	5,425
North America [Member]
Revenue, net:
Total revenue, net	9,868	16,416	42,645	41,414
UNITED STATES
Revenue, net:
Total revenue, net	8,032	15,897	36,879	38,612
MEXICO
Revenue, net:
Total revenue, net	1,310	450	4,553	1,504
All other North America
Revenue, net:
Total revenue, net	526	69	1,213	1,298
RUSSIAN FEDERATION
Revenue, net:
Total revenue, net		536		2,184
All other Europe
Revenue, net:
Total revenue, net	2,578	2,257	13,898	8,803
Europe [Member]
Revenue, net:
Total revenue, net	2,578	2,793	13,898	10,987
Asia [Member]
Revenue, net:
Total revenue, net	1,019	317	2,786	2,386
AUSTRALIA
Revenue, net:
Total revenue, net	850	1,076	4,179	2,478
All other
Revenue, net:
Total revenue, net	$ 285	$ 409	$ 3,363	$ 2,635