Segment Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 31,719,922	$ 36,987,260	$ 104,488,762	$ 117,961,998
Operating profit	2,119,000	3,115,000	9,169,000	10,898,000
Interest & other income	(15,000)	(15,000)	(43,000)	(48,000)
Total earnings before taxes	1,716,000	2,704,000	7,286,000	8,934,000
Total assets	69,725,192		69,725,192		78,570,393
Coil
Segment Reporting Information [Line Items]
Net sales	15,636,000	18,851,000	49,188,000	49,991,000
Operating profit	104,000	446,000	732,000	446,000
Total assets	24,575,000		24,575,000		26,260,000
Tubular
Segment Reporting Information [Line Items]
Net sales	16,084,000	18,136,000	55,301,000	67,971,000
Operating profit	2,015,000	2,669,000	8,437,000	10,452,000
Total assets	26,887,000		26,887,000		39,446,000
Corporate
Segment Reporting Information [Line Items]
Corporate expenses	418,000	426,000	1,926,000	2,012,000
Total assets	18,263,000		18,263,000		12,864,000
Operating Segments
Segment Reporting Information [Line Items]
Total assets	$ 51,462,000		$ 51,462,000		$ 65,706,000