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Note 3 - Revenue Recognition (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Maintenance Plan, Service Requirement, Period Subsequent to One Year Anniversary of Invoice 1 year    
Standard Product Warranty, Term 1 year    
Accounts Receivable, Net, Current, Total $ 238,598 $ 137,499 $ 38,919
Contract with Customer, Liability, Current $ 15,306 $ 6,663 $ 7,998
Minimum [Member]      
Standard Payment Term for Customers 30 days    
Maximum [Member]      
Standard Payment Term for Customers 60 days