Summary of Significant Financial Information Relating to Product Groups (Detail) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 31,960,024	$ 31,719,922	$ 33,334,070	$ 39,434,770	$ 43,559,995	$ 36,987,260	$ 42,039,282	$ 38,935,456	$ 136,448,786	$ 161,521,993
Operating profit									9,086,513	12,114,736
Interest and other income									58,764	91,824
TOTAL EARNINGS BEFORE INCOME TAXES									9,145,277	12,206,560
Total assets	76,575,129				78,570,393				76,575,129	78,570,393
Depreciation									1,790,041	1,839,890
Capital Expenditure									499,486	321,403
Coil
Segment Reporting Information [Line Items]
Net sales									67,045,885	69,198,001
Operating profit									848,252	185,558
Total assets	29,779,697				26,259,762				29,779,697	26,259,762
Depreciation									1,113,053	1,166,077
Capital Expenditure									333,916	249,710
Tubular
Segment Reporting Information [Line Items]
Net sales									69,402,901	92,323,992
Operating profit									10,696,683	14,580,906
Total assets	29,834,246				39,446,078				29,834,246	39,446,078
Depreciation									669,876	670,196
Capital Expenditure									165,570	36,133
Operating Segments
Segment Reporting Information [Line Items]
Operating profit									11,544,935	14,766,464
Total assets	59,613,943				65,705,840				59,613,943	65,705,840
Corporate
Segment Reporting Information [Line Items]
General corporate expenses									(2,458,422)	(2,651,728)
Total assets	16,961,186				12,864,553				16,961,186	12,864,553
Corporate and Other
Segment Reporting Information [Line Items]
Depreciation									7,112	3,617
Capital Expenditure										$ 35,560