REVENUE - Net sales from customers (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 3,667,276	$ 4,270,396	$ 11,075,620	$ 11,990,404
Customer A | Sales Revenue, Net
Revenues	$ 1,215,737	$ 1,124,294	$ 2,320,485	$ 2,117,342
Concentration risk percentage	33.00%	26.00%	21.00%	18.00%
Customer B | Sales Revenue, Net
Revenues	$ 727,084	$ 1,008,264	$ 1,825,213	$ 2,609,284
Concentration risk percentage	20.00%	24.00%	16.00%	22.00%
Customer C | Sales Revenue, Net
Revenues	$ 404,062		$ 1,790,311
Concentration risk percentage	11.00%		16.00%
Customer D | Sales Revenue, Net
Revenues			$ 1,148,242
Concentration risk percentage			10.00%
Customer E | Sales Revenue, Net
Revenues		$ 1,183,208	$ 1,136,146	$ 4,293,047
Concentration risk percentage		28.00%	10.00%	36.00%