CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock [Member]	Paid-in Capital [Member]	Shares To Be Issued [Member]	Statutory Reserves [Member]	Other Comprehensive Income [Member]	Accumulated Retained Earnings [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2012	$ 114,979,201us-gaap_StockholdersEquity	$ 50,224	$ 58,501,643	$ 0	$ 7,766,002	$ 11,554,225	$ 37,107,107	$ 4,376,436
Balance (in shares) at Dec. 31, 2012		50,224,350
Shares issued for system purchase	16,481,108	8,767	16,472,341	0	0	0	0	0
Shares issued for system purchase (in shares)		8,766,547
Capital contribution from noncontrolling interest	0	0	0	0	0	0	0	403,618
Exercise of stock options	1,893	1,893	0	0	0	0	0	0
Exercise of stock options (in shares)		1,892,672
Exercise of warrants	26	26	0	0	0	0	0	0
Exercise of warrants (in shares)		26,489
Net income for year	15,629,536us-gaap_NetIncomeLoss	0	0	0	0	0	15,629,536	186,270
Transfer to statutory reserves	0creg_TransferToStatutoryReserve	0	0	0	1,906,752	0	(1,906,752)	0
Purchase of noncontrolling interest of Erdos TCH	2,929,469	0	3,156,069	0	0	0	(226,600)	(4,624,799)
Foreign currency translation gain	4,655,178	0	0	0	0	4,655,178	0	3,592
Balance at Dec. 31, 2013	154,676,411us-gaap_StockholdersEquity	60,910	78,130,053	0	9,672,754	16,209,403	50,603,291	345,117
Balance (in shares) at Dec. 31, 2013		60,910,058
Shares issued for system purchase	14,491,451	8,234	14,483,217	0	0	0	0	0
Shares issued for system purchase (in shares)		8,233,779
Exercise of stock options	0	36	(36)	0	0	0	0	0
Exercise of stock options (in shares)		36,124
Shares purchased by officer	18,918,173	13,829	18,904,344	0	0	0	0	0
Shares purchased by officer (in shares)		13,829,074
Shares to be issued for IR service	187,500	0	0	187,500	0	0	0	0
Net income for year	19,811,922us-gaap_NetIncomeLoss	0	0	0	0	0	19,811,922	(86,730)
Transfer to statutory reserves	0creg_TransferToStatutoryReserve	0	0	0	2,215,416	0	(2,215,416)	0
Foreign currency translation gain	(222,265)	0	0	0	0	(222,265)	0	(1,588)
Balance at Dec. 31, 2014	$ 207,863,192us-gaap_StockholdersEquity	$ 83,009	$ 111,517,578	$ 187,500	$ 11,888,170	$ 15,987,138	$ 68,199,797	$ 256,799
Balance (in shares) at Dec. 31, 2014		83,009,035

It represents the purchase of noncontrolling interest during the period.

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