Revenue Recognition - Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue:
Total revenue	$ 20,775	$ 17,196	$ 39,427	$ 33,278
Product and accessories
Revenue:
Total revenue	10,603	8,465	19,770	16,854
Total from Micro turbine Products
Revenue:
Total revenue			19,344	16,664
Accessories and parts
Revenue:
Total revenue			426	190
Parts, service and rentals
Revenue:
Total revenue	$ 10,172	$ 8,731	19,657	16,424
Total North America
Revenue:
Total revenue			28,071	17,205
United States
Revenue:
Total revenue			25,788	15,174
Mexico
Revenue:
Total revenue			1,054	1,584
All other North America
Revenue:
Total revenue			1,229	447
Russia
Revenue:
Total revenue			1,294	2,206
All other Europe
Revenue:
Total revenue			5,804	5,612
Total Europe
Revenue:
Total revenue			7,098	7,818
Asia
Revenue:
Total revenue			1,199	823
Australia
Revenue:
Total revenue			2,051	3,342
All other
Revenue:
Total revenue			$ 1,008	$ 4,090