Note I - Fair Value Measurements - Recurring and Non-Recurring Fair Value Measurements (Details)	Jun. 30, 2020 USD ($)
Commodity Contract [Member]
Commodity futures – financial assets	$ 54,000
Fair Value, Recurring [Member]
Total	54,000
Fair Value, Recurring [Member] | Commodity Contract [Member]
Commodity futures – financial assets	54,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total	54,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commodity Contract [Member]
Commodity futures – financial assets	54,000
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member]
Commodity futures – financial assets
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member]
Commodity futures – financial assets
Fair Value, Nonrecurring [Member]
Total	1,771,450
Long-lived assets held and used	1,771,450	[1]
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total
Long-lived assets held and used		[1]
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total
Long-lived assets held and used		[1]
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total	1,771,450
Long-lived assets held and used	$ 1,771,450	[1]

[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.