Segment Information (Detail) (USD $)	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014
Segment Reporting Information [Line Items]
Net Sales	$ 27,904,521	$ 29,582,144
Interest & other income	15,252	15,506
Earnings (loss) before income taxes	(77,263)	1,154,450
Total assets	70,368,073		72,284,399
Operating Segments
Segment Reporting Information [Line Items]
Operating profit (loss)	368,000	1,828,000
Total assets	58,467,000		56,103,000
Operating Segments | Coil
Segment Reporting Information [Line Items]
Net Sales	17,906,000	17,163,000
Operating profit (loss)	(404,000)	178,000
Total assets	24,451,000		22,308,000
Operating Segments | Tubular
Segment Reporting Information [Line Items]
Net Sales	9,999,000	12,419,000
Operating profit (loss)	772,000	1,650,000
Total assets	34,016,000		33,795,000
Corporate and other
Segment Reporting Information [Line Items]
Corporate expenses	460,000	689,000
Total assets	$ 11,901,000		$ 16,181,000