Note E - Segment Information (Details) - USD ($)	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016
Operating Segments [Member] | Coil [Member]
Net sales	$ 18,999,000	$ 19,348,000
Total net sales	18,999,000	19,348,000
Operating profit (loss)	(1,515,000)	2,155,000
Identifiable assets	26,188,000		$ 25,317,000
Operating Segments [Member] | Tubular [Member]
Net sales	3,395,000	4,621,000
Total net sales	3,395,000	4,621,000
Operating profit (loss)	(274,000)	(637,000)
Identifiable assets	36,792,000		37,543,000
Operating Segments [Member]
Operating profit (loss)	(1,789,000)	1,518,000
Identifiable assets	62,980,000		62,860,000
Corporate, Non-Segment [Member]
Corporate expenses	557,000	729,000
Identifiable assets	2,887,000		4,030,000
Net sales	22,393,764	23,968,569
Total net sales	22,393,764	23,968,569
Operating profit (loss)	(2,345,738)	788,437
Interest & other income	(14,750)	(17,250)
Earnings (loss) before income taxes	(2,330,988)	$ 805,687
Identifiable assets	$ 65,867,022		$ 66,890,397