Investments in a jointly-controlled entity (Details 1) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Entity's assets and liabilities:
Current assets	$ 6,831,666		$ 8,098,594
Current liabilities	(34,389,086)		(36,779,064)
Non-current liabilities	187,261		207,717
NET ASSETS (LIABILITIES)	(430,686)		(1,319,018)
Share of jointly-controlled entity's results:
Net sales	14,460,228	42,413,020	48,674,460
Gross profit	(98,515)	364,771	698,848
Net profit (loss)	888,332	(865,668)	(181,693)
ATMD (Hong Kong) Limited [Member]
Entity's assets and liabilities:
Current assets	28,179,625		23,490,550
Non-current assets	68,554		69,921
Current liabilities	(25,107,894)		(20,742,164)
Non-current liabilities	(3,490)		0
NET ASSETS (LIABILITIES)	3,136,795		2,818,307
Share of jointly-controlled entity's results:
Net sales	31,338,207		48,674,460
Gross profit	733,977		698,848
Net profit (loss)	$ 318,488		$ (181,693)