Revenue Recognition - Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Revenue, net:
Total revenue, net	$ 19,606	$ 20,609	$ 59,033	$ 53,887
Product and accessories
Revenue, net:
Total revenue, net	10,003	12,329	29,773	29,183
Total from Micro turbine Products
Revenue, net:
Total revenue, net			28,201	28,234
Accessories and parts
Revenue, net:
Total revenue, net			1,572	949
Parts, service and rentals
Revenue, net:
Total revenue, net	$ 9,603	$ 8,280	29,260	24,704
Total North America
Revenue, net:
Total revenue, net			42,866	28,674
United States
Revenue, net:
Total revenue, net			38,798	26,052
Mexico
Revenue, net:
Total revenue, net			2,684	2,142
All other North America
Revenue, net:
Total revenue, net			1,384	480
Russia
Revenue, net:
Total revenue, net			2,138	3,099
All other Europe
Revenue, net:
Total revenue, net			8,377	8,911
Total Europe
Revenue, net:
Total revenue, net			10,515	12,010
Asia
Revenue, net:
Total revenue, net			1,732	1,755
Australia
Revenue, net:
Total revenue, net			2,529	3,861
All other
Revenue, net:
Total revenue, net			$ 1,391	$ 7,587