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Note E - Leases (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2019
Dec. 31, 2022
Dec. 31, 2023
Finance Lease, Liability, to be Paid     $ 82,000
Operating Lease, Weighted Average Remaining Lease Term (Year)     19 years 4 months 24 days
Finance Lease, Weighted Average Remaining Lease Term (Year)     9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent     2.60%
Finance Lease, Weighted Average Discount Rate, Percent     1.90%
Heavy-duty Forklift [Member]      
Lessee, Finance Lease, Term of Contract (Year) 5 years    
Finance Lease, Liability, to be Paid $ 500,000    
Finance Lease, Monthly Payment $ 9,000    
Granite City, IL Facility [Member]      
Operating Lease, Quarterly Payments     $ 19,000
Granite City, IL Facility [Member] | Plateplus Inc. [Member]      
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability   $ 1,200,000  
Office Space in Longview, Texas [Member]      
Operating Lease, Monthly Payments     $ 5,000