Segment Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Revenues:
Revenues	$ 17,635,271		$ 13,884,699
Depreciation:
Depreciation	1,965,274		1,569,551
Interest expense:
Interest expense	57,727		105,127
Net income (loss):
Net income (loss)	2,396,358		1,622,600
Identifiable long-lived tangible assets by segment:
Identifiable long-lived tangible assets	75,878,478				75,346,344
Identifiable long-lived tangible assets by geographical location:
Identifiable long-lived tangible assets	75,878,478				75,346,344
Forged Rolled Rings and Related Components [Member]
Revenues:
Revenues	8,257,133		6,526,701
Depreciation:
Depreciation	1,217,058		1,046,577
Interest expense:
Interest expense	22,565		47,152
Net income (loss):
Net income (loss)	1,229,436		796,566
Identifiable long-lived tangible assets by segment:
Identifiable long-lived tangible assets	42,412,116				43,987,670
Dyeing and Finishing Equipment [Member]
Revenues:
Revenues	9,378,138		7,357,998
Depreciation:
Depreciation	748,216		522,974
Interest expense:
Interest expense	35,162		57,975
Net income (loss):
Net income (loss)	1,345,556		961,159
Identifiable long-lived tangible assets by segment:
Identifiable long-lived tangible assets	28,754,866				26,607,468
Other [Member]
Net income (loss):
Net income (loss)	(178,634)	[1]	(135,125)	[1]
Equipment Held For Operating Lease [Member]
Identifiable long-lived tangible assets by segment:
Identifiable long-lived tangible assets	4,711,496	[2]			4,751,206	[2]
China [Member]
Identifiable long-lived tangible assets by geographical location:
Identifiable long-lived tangible assets	75,878,478				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 any general and administrative expenses of its U.S. activities to its reportable segments, because these activities are managed at a corporate level.

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