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Note B - Business Combinations (Details Textual) - Plateplus Inc. [Member] - USD ($)		3 Months Ended			6 Months Ended	9 Months Ended
	Apr. 30, 2022	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2022
Business Combination, Consideration Transferred, Total	$ 76,500,000
Payments to Acquire Businesses, Gross	$ 71,700,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable				$ 4,783,700	$ 4,783,700	$ 4,800,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)	516,041				516,041
Goodwill, Ending Balance	$ 0
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual				$ 1,000,000
Selling, General and Administrative Expenses [Member]
Business Combination, Acquisition Related Costs						1,200,000
East Chicago and Granite City [Member]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		$ 52,000,000.0				175,000,000.0
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ 4,600,000				10,300,000
Houston and Loudon [Member]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual						43,400,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual						$ 300,000
ABL Facility [Member] \| JPMorgan Chase Bank N.A. [Member]
Business Combination, Consideration Transferred, Liabilities Incurred	$ 64,000,000.0		$ 7,900,000