COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2016

COMMITMENTS AND CONTINGENCIES [Abstract]

Schedule of product warranty activity

	At December 31,
	2015		2016
Beginning balance	$	31,778,365	$	36,023,946
Warranty provision		8,815,974		5,774,308
Revision of warranty costs		(3,249,623)		(4,429,833)
Warranty expense incurred		(18,132)		-
Foreign exchange effect		(1,302,638)		(2,309,448)
Ending balance	$	36,023,946	$	35,058,973