Revenue Recognition - Revenues (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Revenue, net:
Total revenue, net	$ 21,010	$ 20,124	$ 18,765	$ 38,889	$ 59,899	$ 73,882	$ 63,964
Product and accessories
Revenue, net:
Total revenue, net	$ 11,427	$ 9,594	$ 9,534	$ 19,128	$ 30,555	35,033	32,720
Total from Micro turbine Products
Revenue, net:
Total revenue, net						33,196	31,367
Accessories
Revenue, net:
Total revenue, net						1,837	1,353
Parts and Service
Revenue, net:
Total revenue, net						30,684	28,475
Revenue under non-ASC-606 related to labor reimbursement of FPP contracts						400	300
Rentals
Revenue, net:
Total revenue, net						8,165	2,769
Total North America
Revenue, net:
Total revenue, net						49,473	34,575
United States
Revenue, net:
Total revenue, net						45,071	30,269
Mexico
Revenue, net:
Total revenue, net						2,990	3,706
All other North America
Revenue, net:
Total revenue, net						1,412	600
Russia
Revenue, net:
Total revenue, net						3,045	3,381
All other Europe
Revenue, net:
Total revenue, net						11,553	10,872
Total Europe
Revenue, net:
Total revenue, net						14,598	14,253
Asia
Revenue, net:
Total revenue, net						3,251	5,978
Australia
Revenue, net:
Total revenue, net						2,840	4,195
All other
Revenue, net:
Total revenue, net						$ 3,720	$ 4,963