Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts (Narrative) (Details)	9 Months Ended	12 Months Ended
	Dec. 31, 2016	Mar. 31, 2016
Expected collection period of accounts receivable	60 days
Minimum [Member]
Estimated Period To Complete Contracts In Process, Minimum	1 month	1 month
Maximum [Member]
Estimated Period To Complete Contracts In Process, Maximum	6 months	13 months