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Note A - Nature of Business and Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
Mar. 31, 2025
$ / shares
Sep. 30, 2024
USD ($)
$ / shares
Mar. 31, 2024
USD ($)
$ / shares
Jun. 30, 2025
USD ($)
$ / shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Accounts Receivable, Allowance for Credit Loss $ 17,169           $ 17,169 $ 14,342
Contract with Customer, Liability, Current 12,177           12,177 0
Cash, Uninsured Amount 1,300           1,300 234,000
Cash, SIPC Uninsured Amount 502,000           502,000 563,000
Common Stock, Dividends, Per Share, Cash Paid | $ / shares   $ 0.6 $ 0.6          
Payments of Ordinary Dividends, Common Stock             2,756,429 2,756,323
Dividends payable 163           163 268
Payments for Dividends in Arrears 10,290              
Impairment, Long-Lived Asset, Held-for-Use             $ 0 $ 0
Number of Vendors             3 3
Unrecognized Tax Benefits 0           $ 0 $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 0           $ 0 $ 0
Distributors and Marketing Partners [Member]                
Number of Customers             4 4
Factory Equipment And Fixtures [Member] | Minimum [Member]                
Property, Plant and Equipment, Useful Life (Year) 5 years           5 years  
Factory Equipment And Fixtures [Member] | Maximum [Member]                
Property, Plant and Equipment, Useful Life (Year) 7 years           7 years  
Building [Member]                
Property, Plant and Equipment, Useful Life (Year) 40 years           40 years  
Building Improvements [Member]                
Property, Plant and Equipment, Useful Life (Year) 20 years           20 years  
O 2025 H1 Dividends [Member]                
Common Stock, Dividends, Per Share, Cash Paid | $ / shares           $ 0.35    
Dividends Payable, Date to be Paid           Feb. 18, 2025    
Dividends Payable, Date of Record           Feb. 10, 2025    
Payments of Ordinary Dividends, Common Stock           $ 1,608,012    
Payments of Ordinary Dividends, Common Stock           $ 1,607,893    
Dividends payable $ 119           $ 119  
O 2025 Q3 Dividends [Member]                
Common Stock, Dividends, Per Share, Cash Paid | $ / shares   $ 0.25            
Dividends Payable, Date to be Paid   Aug. 01, 2025            
Dividends Payable, Date of Record   Jul. 25, 2025            
Payments of Ordinary Dividends, Common Stock   $ 1,148,536            
Dividends payable 44           44  
O 2024 Q3 Dividends [Member]                
Common Stock, Dividends, Per Share, Cash Paid | $ / shares       $ 0.35        
Dividends Payable, Date to be Paid       Jul. 31, 2024        
Dividends Payable, Date of Record       Jul. 23, 2024        
Payments of Ordinary Dividends, Common Stock       $ 1,607,855        
Dividends payable       $ 156        
O 2024 Q1 Dividends [Member]                
Common Stock, Dividends, Per Share, Cash Paid | $ / shares         $ 0.25      
Dividends Payable, Date to be Paid         Feb. 20, 2024      
Dividends Payable, Date of Record         Feb. 12, 2024      
Payments of Ordinary Dividends, Common Stock         $ 1,148,468      
Dividends payable         $ 112      
Accrued Expenses [Member]                
Allowance for Material Returns $ 194,947           $ 194,947 $ 276,732
Revenue Benchmark [Member] | Product Concentration Risk [Member] | LUBRAJEL and RENACIDIN IRRIGATION [Member]                
Concentration Risk, Percentage             93.00%  
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Lubrajel [Member]                
Concentration Risk, Percentage             48.00% 60.00%
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Renacidin [Member]                
Concentration Risk, Percentage             45.00% 33.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Personal Care [Member] | Non-US [Member]                
Concentration Risk, Percentage             23.00% 16.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | ASI [Member] | Non-US [Member]                
Concentration Risk, Percentage             77.00% 79.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | ASI [Member] | CHINA                
Concentration Risk, Percentage             41.00% 43.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Distributors and Marketing Partners [Member]                
Concentration Risk, Percentage             74.00% 80.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributors and Marketing Partners [Member]                
Concentration Risk, Percentage             82.00% 87.00%
Cost of Goods and Service, Product and Service Benchmark [Member] | Supplier Concentration Risk [Member] | Three Raw Material Vendors [Member]                
Concentration Risk, Percentage             82.00% 83.00%