REVENUE - net sales from customers (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues	$ 3,621,185	$ 4,588,894	$ 7,720,008	$ 10,419,280
Customer A [Member] | Sales Revenue, Net [Member]
Revenues	$ 1,516,399	$ 2,061,276	$ 3,109,839	$ 4,950,432
Concentration Risk, Percentage	42.00%	45.00%	40.00%	48.00%
Customer B [Member] | Sales Revenue, Net [Member]
Revenues	$ 585,873		$ 1,601,021
Concentration Risk, Percentage	16.00%		21.00%
Customer C [Member] | Sales Revenue, Net [Member]
Revenues	$ 619,094	$ 746,877	$ 993,048	$ 2,330,088
Concentration Risk, Percentage	17.00%	16.00%	13.00%	22.00%
Customer D [Member] | Sales Revenue, Net [Member]
Revenues				$ 1,079,832
Concentration Risk, Percentage				10.00%