Revenue Recognition - Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue, net:
Total revenue, net	$ 28,368	$ 20,124	$ 52,271	$ 38,889
Product [Member]
Revenue, net:
Total revenue, net	15,092	9,594	28,299	19,392
Microturbine Products
Revenue, net:
Total revenue, net	14,468	9,344	27,475	18,748
Accessories
Revenue, net:
Total revenue, net	624	250	824	644
Service [Member]
Revenue, net:
Total revenue, net	9,637	8,765	17,303	16,440
Rentals
Revenue, net:
Total revenue, net	3,639	1,765	6,669	3,057
North America [Member]
Revenue, net:
Total revenue, net	19,948	12,902	32,777	24,998
UNITED STATES
Revenue, net:
Total revenue, net	17,313	11,796	28,847	22,715
MEXICO
Revenue, net:
Total revenue, net	2,519	444	3,243	1,054
All other North America
Revenue, net:
Total revenue, net	116	662	687	1,229
RUSSIAN FEDERATION
Revenue, net:
Total revenue, net		848		1,648
All other Europe
Revenue, net:
Total revenue, net	4,414	3,840	11,320	6,546
Europe [Member]
Revenue, net:
Total revenue, net	4,414	4,688	11,320	8,194
Asia [Member]
Revenue, net:
Total revenue, net	1,073	855	1,767	2,069
AUSTRALIA
Revenue, net:
Total revenue, net	331	1,097	3,329	1,402
All other
Revenue, net:
Total revenue, net	$ 2,602	$ 582	$ 3,078	$ 2,226