Note E - Segment Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Coil [Member] | Operating Segments [Member]
Net sales	$ 18,288,000	$ 21,275,000	$ 37,635,000	$ 39,182,000
Operating profit (loss)	885,000	410,000	3,040,000	6,000
Tubular [Member] | Operating Segments [Member]
Net sales	4,878,000	10,269,000	9,499,000	20,267,000
Operating profit (loss)	(710,000)	1,325,000	(1,347,000)	2,097,000
Operating Segments [Member]
Net sales	23,166,000	31,544,000	47,134,000	59,449,000
Operating profit (loss)	175,000	1,735,000	1,693,000	2,103,000
Corporate, Non-Segment [Member]
Corporate expenses	480,000	611,000	1,210,000	1,072,000
Net sales	23,165,705	31,544,474	47,134,273	59,448,996
Interest & other income	(17,250)	(15,282)	(34,500)	(30,534)
Total earnings (loss) before taxes	$ (287,883)	$ 1,139,359	$ 517,804	$ 1,062,096