Segment Information (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Revenues:
Revenue:	$ 17,528,018		$ 17,214,134		$ 35,163,289		$ 31,098,833
Depreciation:
Depreciation	2,119,516		1,651,608		4,084,790		3,221,159
Interest expense:
Interest expense	60,099		64,526		117,826		169,653
Net income (loss):
Net income (loss)	2,217,904		2,322,553		4,614,262		3,945,153
Identifiable long-lived tangible assets by segment:
Identifiable long-lived tangible assets	77,376,719				77,376,719				75,346,344
Identifiable long-lived tangible assets by geographical location:
Identifiable long-lived tangible assets	77,376,719				77,376,719				75,346,344
Forged Rolled Rings and Related Components [Member]
Revenues:
Revenue:	7,849,812		8,197,830		16,106,945		14,724,531
Depreciation:
Depreciation	1,207,337		1,059,267		2,424,395		2,105,844
Interest expense:
Interest expense	22,638		32,761		45,203		79,913
Net income (loss):
Net income (loss)	1,044,684		1,223,554		2,274,120		2,020,120
Identifiable long-lived tangible assets by segment:
Identifiable long-lived tangible assets	41,250,263				41,250,263				43,987,670
Dyeing and Finishing Equipment [Member]
Revenues:
Revenue:	9,678,206		9,016,304		19,056,344		16,374,302
Depreciation:
Depreciation	744,192		592,341		1,492,408		1,115,315
Interest expense:
Interest expense	37,461		31,765		72,623		89,740
Net income (loss):
Net income (loss)	1,328,042		1,258,828		2,673,598		2,219,987
Identifiable long-lived tangible assets by segment:
Identifiable long-lived tangible assets	31,577,395				31,577,395				26,607,468
Other [Member]
Depreciation:
Depreciation	167,987	[1]		[1]	167,987	[1]		[1]
Net income (loss):
Net income (loss)	(154,822)	[2]	(159,829)	[2]	(333,456)	[2]	(294,954)	[2]
Equipment Held For Operating Lease [Member]
Identifiable long-lived tangible assets by segment:
Identifiable long-lived tangible assets	4,549,061				4,549,061				4,751,206
China [Member]
Identifiable long-lived tangible assets by geographical location:
Identifiable long-lived tangible assets	77,376,719				77,376,719				75,346,344
United States [Member]
Identifiable long-lived tangible assets by geographical location:
Identifiable long-lived tangible assets

[1] The Company does not allocate the equipment held for operating lease to any operating segment.

[2] The Company does not allocate any general and administrative expenses of its U.S. activities to its reportable segments, because these activities are managed at a corporate level.