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Note I - Fair Value Measurements - Recurring and Non-recurring Fair Value Measurements (Details) - USD ($)		Dec. 31, 2020	Mar. 31, 2020
Fair Value, Nonrecurring [Member]
Derivative asset		$ 1,440,120
Total		1,440,120
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative asset		1,440,120
Total		1,440,120
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative asset
Total
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative asset
Total
Fair Value, Recurring [Member]
Total			$ 1,771,450
Long-lived assets held and used (1)	[1]		1,771,450
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total
Long-lived assets held and used (1)	[1]
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total
Long-lived assets held and used (1)	[1]
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total			1,771,450
Long-lived assets held and used (1)	[1]		$ 1,771,450
[1] At March 31, 2020, the Company performed an impairment review of the tubular segment's pipe finishing facility that resulted in the assets being written down to their estimated fair value of $1,771,450.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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