REVENUE - disaggregated basis (Details) - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 4,334,268	$ 4,098,823
Over-time [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,052,938	3,838,927
Point-in-time [Member]
Revenue from Contract with Customer, Including Assessed Tax	1,281,330	259,896
Defense [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,409,291	3,809,087
Energy [Member]
Revenue from Contract with Customer, Including Assessed Tax	261,666	261,430
Industrial [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 663,311	$ 28,306