Segment Information (Details) (USD $)	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012
Segment information, reportable segments
Net sales	$ 39,434,770	$ 38,935,456
Operating profit (loss)	4,040,000	3,587,000
Interest & other income	(12,000)	(18,000)
Earnings before income taxes	3,100,000	2,755,000
Total assets	73,521,306		78,570,393
Coil [Member]
Segment information, reportable segments
Net sales	16,830,000	15,430,000
Operating profit (loss)	354,000	(329,000)
Total assets	23,281,000		26,260,000
Tubular [Member]
Segment information, reportable segments
Net sales	22,605,000	23,505,000
Operating profit (loss)	3,686,000	3,916,000
Total assets	35,386,000		39,446,000
Operating Segments [Member]
Segment information, reportable segments
Total assets	58,667,000		65,706,000
Corporate [Member]
Segment information, reportable segments
Corporate expenses	952,000	850,000
Total assets	$ 14,854,000		$ 12,864,000