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v3.26.1

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%

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