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Note F - Property, Plant and Equipment (Details Textual)
$ in Thousands
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
May 25, 2021
ft²
a
Buildings and Improvements, Gross $ 28,558 $ 28,550  
Construction in Progress, Gross 1,598 $ 1,167  
Facility in Sinton, Texas [Member]      
Area of Land (Acre) | a     26.5
Lessee, Operating Lease, Term of Contract (Year)     99 years
Capitalized Property Plant and Equipment [Member]      
Buildings and Improvements, Gross 22,200    
Construction in Progress, Gross 1,600    
Facility in Sinton, Texas [Member]      
Area of Real Estate Property (Square Foot) | ft²     70,000
Upgrade of Decatur, AL Processing Line [Member]      
Construction in Progress, Gross 1,100    
Capital Expenditures, Expected Cost $ 2,100