Segment Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 28,274,696	$ 31,719,922	$ 84,167,208	$ 104,488,762
Operating profit (loss)	1,195,000	2,119,000	3,430,000	9,169,000
Interest & other income	(15,000)	(15,000)	(46,000)	(43,000)
Total earnings before taxes	740,293	1,716,301	1,942,499	7,286,206
Total assets	71,632,791		71,632,791		76,575,129
Coil
Segment Reporting Information [Line Items]
Net sales	14,554,000	15,636,000	46,394,000	49,188,000
Operating profit (loss)	(389,000)	104,000	(911,000)	732,000
Total assets	24,387,000		24,387,000		29,780,000
Tubular
Segment Reporting Information [Line Items]
Net sales	13,721,000	16,084,000	37,773,000	55,301,000
Operating profit (loss)	1,584,000	2,015,000	4,341,000	8,437,000
Total assets	29,054,000		29,054,000		29,834,000
Corporate
Segment Reporting Information [Line Items]
Corporate expenses	470,000	418,000	1,534,000	1,926,000
Total assets	18,192,000		18,192,000		16,961,000
Operating Segments
Segment Reporting Information [Line Items]
Total assets	$ 53,441,000		$ 53,441,000		$ 59,614,000