Note E - Segment Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Operating Segments [Member] | Coil [Member]
Net sales	$ 15,203,000	$ 15,981,000	$ 52,838,000	$ 55,162,000
Operating profit (loss)	1,817,000	416,000	4,858,000	422,000
Operating Segments [Member] | Tubular [Member]
Net sales	3,345,000	7,572,000	12,845,000	27,840,000
Operating profit (loss)	(977,000)	128,000	(2,324,000)	2,225,000
Operating Segments [Member]
Net sales	18,548,000	23,553,000	65,683,000	83,002,000
Operating profit (loss)	840,000	544,000	2,534,000	2,647,000
Corporate, Non-Segment [Member]
Corporate expenses	473,000	261,000	1,683,000	1,333,000
Net sales	18,548,247	23,552,636	65,682,520	83,001,633
Interest & other income	(328,560)	(15,250)	(363,060)	(45,784)
Total earnings before taxes	$ 696,167	$ 297,717	$ 1,213,971	$ 1,359,814