Note A - Nature of Business and Summary of Significant Accounting Policies (Detail) (USD $)	1 Months Ended			0 Months Ended	12 Months Ended
	Dec. 21, 2012	Jun. 18, 2012	Dec. 23, 2011	Jun. 13, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2008
Cash, FDIC Insured Amount (in Dollars)					$ 250,000
Common Stock, Dividends, Per Share, Cash Paid (in Dollars per share)	$ 0.44	$ 0.42	$ 0.44	$ 0.36
Payments of Ordinary Dividends, Common Stock (in Dollars)					6,251,158
Payments of Ordinary Dividends (in Dollars)						3,677,151
Income Taxes Paid (in Dollars)					2,024,245	2,010,000
Amortization Expense, Annual Amount (in Dollars)							37,672
Research and Development Expense (in Dollars)					693,000	637,000
Shipping, Handling and Transportation Costs (in Dollars)					65,000	109,000
Advertising Expense (in Dollars)					24,000	28,000
Two Customers [Member] | Percent of Total Revenues Derived [Member]
Concentration Risk, Percentage					62.00%	58.00%
Two Customers [Member] | Percent of Outstanding Accounts Receivable At Year End [Member]
Concentration Risk, Percentage					52.00%	54.00%
LUBRAJEL® And RENACIDIN IRRIGATION® [Member] | Percent Of Total Revenue Derived From Two Major Product Lines [Member]
Concentration Risk, Percentage					94.10%	94.50%
LUBRAJEL [Member] | Percent Of Total Revenue Derived From Two Major Product Lines [Member]
Concentration Risk, Percentage						81.80%
LUBRAJEL [Member] | Percent Of Total Revenue Derived From Product Line [Member]
Concentration Risk, Percentage					86.50%
RENACIDIN [Member] | Percent Of Total Revenue Derived From Two Major Product Lines [Member]
Concentration Risk, Percentage					7.60%	12.70%
Special Dividend [Member]
Common Stock, Dividends, Per Share, Cash Paid (in Dollars per share)	$ 0.50
Factory Equipment and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life						5 years
Factory Equipment and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life						7 years
Building [Member]
Property, Plant and Equipment, Useful Life						40 years
Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life						20 years
Waste Disposal System [Member]
Finite-Lived Intangible Asset, Useful Life						7 years
Percent of Total Raw Material Purchases Derived [Member] | Five Major Raw Material Vendors [Member]
Concentration Risk, Percentage					77.00%	83.00%
Regulatory and Validation Work [Member]
Finite-Lived Intangible Asset, Useful Life							5 years
Payments for Purchase of Other Assets (in Dollars)							$ 188,360