Segment Information (Detail) (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net Sales	$ 29,582,144	$ 39,434,770
Operating profit	1,828,000	4,040,000
Interest & other income	(15,000)	(12,000)
Earnings before taxes	1,154,450	3,100,130
Total assets	69,951,666		76,575,129
Coil
Segment Reporting Information [Line Items]
Net Sales	17,163,000	16,830,000
Operating profit	178,000	354,000
Total assets	20,244,000		29,780,000
Tubular
Segment Reporting Information [Line Items]
Net Sales	12,419,000	22,605,000
Operating profit	1,650,000	3,686,000
Total assets	31,051,000		29,834,000
Corporate
Segment Reporting Information [Line Items]
Corporate expenses	689,000	952,000
Total assets	18,657,000		16,961,000
Operating Segments
Segment Reporting Information [Line Items]
Total assets	$ 51,295,000		$ 59,614,000