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Note A - Allowance for Doubtful Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Balance at beginning of year $ 20,526 $ 20,526
Charges to costs and expenses
Deductions from reserves $ (6,741)
Balance at end of year $ 13,785 $ 20,526