REVENUE - Net sales from customers (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues	$ 3,074,076	$ 3,621,185	$ 7,408,344	$ 7,720,008
Customer A | Sales Revenue, Net
Revenues	$ 663,855		$ 1,386,249
Concentration risk percentage	22.00%		19.00%
Customer B | Sales Revenue, Net
Revenues	$ 510,599	$ 585,873	$ 1,098,129	$ 1,601,021
Concentration risk percentage	17.00%	16.00%	15.00%	21.00%
Customer C | Sales Revenue, Net
Revenues		$ 1,516,399	$ 1,097,563	$ 3,109,839
Concentration risk percentage		42.00%	15.00%	40.00%
Customer D | Sales Revenue, Net
Revenues	$ 815,742	$ 619,094	$ 1,104,747	$ 993,048
Concentration risk percentage	27.00%	17.00%	15.00%	13.00%
Customer E | Sales Revenue, Net
Revenues	$ 305,114		$ 923,133
Concentration risk percentage	10.00%		12.00%
Customer F | Sales Revenue, Net
Revenues	$ 336,935
Concentration risk percentage	11.00%