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Note 3 - Customers Representing 5% or More of Total Revenue (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Major Customers 1 [Member]    
Revenue by Customer $ 112,800 $ 59,900
Major Customers 2 [Member]    
Revenue by Customer 63,400 43,800
Major Customers 3 [Member]    
Revenue by Customer 25,900 40,000
Major Customers 4 [Member]    
Revenue by Customer 20,000 23,300
Major Customers 5 [Member]    
Revenue by Customer 16,600 21,400
Major Customers 6 [Member]    
Revenue by Customer $ 15,600 17,300
Major Customers 7 [Member]    
Revenue by Customer 15,800
Revenue by Customer $ 288,308 $ 252,941