Note H - Revenue - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Net Sales	$ 48,193,318	$ 23,083,269
Coil [Member]
Net Sales	31,129,200	18,009,835
Coil [Member] \| Prime Coil [Member]
Net Sales	24,776,031	14,275,590
Coil [Member] \| Secondary Coil [Member]
Net Sales	6,110,458	3,368,604
Coil [Member] \| Customer Owned [Member]
Net Sales	242,711	365,641
Tubular [Member]
Net Sales	17,064,118	5,073,434
Tubular [Member] \| Manufactured Pipe [Member]
Net Sales	10,955,387	3,333,434
Tubular [Member] \| Mill Reject Pipe [Member]
Net Sales	5,420,861	1,221,936
Tubular [Member] \| Pipe Finishing Services [Member]
Net Sales	$ 687,870	$ 518,064

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration