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Note D - Concentration of Risk (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash, Uninsured Amount $ 0 $ 811,000
Accounts Receivable, Net 3,635,946 3,133,246
Allowance for Doubtful Accounts Receivable, Noncurrent $ 1,000,000 $ 500,000
Percentage of Remaining Balance Owned Reserved 57.00%  
Customer B [Member]    
Accounts Receivable, Net $ 1,760,000  
Allowance for Doubtful Accounts Receivable, Noncurrent $ 1,000,000  
Percentage of Remaining Balance Owned Reserved 57.00%