Intangible Assets - Solar Turbines (Details) - Solar Turbines Incorporated - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Intangible Assets
Years subject to payment of per-unit royalty fees			17 years
Royalties earned	$ 9,200	$ 10,000	$ 16,400	$ 17,100
Unpaid earned royalties	$ 42,500		$ 42,500		$ 26,100