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Note 1 - Summary of Significant Accounting Policies -2 (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended 190 Months Ended 199 Months Ended
Feb. 22, 2017
USD ($)
Nov. 29, 2016
USD ($)
Oct. 27, 2016
Aug. 31, 2015
USD ($)
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2018
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Jul. 11, 2018
$ / shares
Jul. 10, 2018
$ / shares
Feb. 21, 2018
$ / shares
Dec. 28, 2017
$ / shares
Apr. 19, 2017
$ / shares
Oct. 04, 2016
$ / shares
Common Stock, Shares, Outstanding, Ending Balance | shares         13,398,339   13,398,339     6,943,283 4,564,428 6,943,283 13,398,339            
Common Stock, Par or Stated Value Per Share | $ / shares         $ 0.01   $ 0.01     $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01
Stockholders' Equity, Period Increase (Decrease), Total                       $ 29,065,934 $ 36,490,000            
Stock Issued During Period, Value, New Issues             $ 2,755,087 $ 3,421,188   $ 3,421,188                  
Proceeds from Issuance or Sale of Equity, Total       $ 13,800,000     3,405,052                        
Debt Instrument, Increase (Decrease), Net, Total                       5,685,000 5,685,000            
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent                   34.00%                  
Advertising Expense                   $ 37,060 $ 71,212                
Research and Development Expense, Total                   289,000 406,000                
Depreciation, Total         $ 26,120 $ 14,561 59,442 44,764   58,872 73,249                
Amortization of Intangible Assets, Total         38,387 3,276 46,127 9,067   12,689 9,107                
Unrecognized Tax Benefits, Ending Balance         0   0     0   0 0            
Cash, Uninsured Amount         0   $ 0     563,000   563,000 0            
Product Warranty Expense                   $ 6,209 34,665                
Number of Operating Segments             2     2                  
Non-US [Member]                                      
Revenues, Total         $ 4,195 $ 288 $ 10,061 25,188   $ 26,662                  
Scenario, Forecast [Member]                                      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent                 21.00%                    
Private Placement [Member]                                      
Stock Issued During Period, Value, New Issues                   1,213,819                  
IPO [Member]                                      
Stock Issued During Period, Value, New Issues                       13,555,003 13,555,003            
Proceeds from Issuance or Sale of Equity, Total                       3,937,500 3,937,500            
The 2016 Registered Direct Offering [Member]                                      
Stock Issued During Period, Value, New Issues                     $ 1,625,905                
Proceeds from Issuance or Sale of Equity, Net of Stock Issuance Costs   $ 1,739,770                   1,739,770 1,739,770            
Proceeds from Issuance or Sale of Equity, Total   $ 1,983,337                                  
Over-Allotment Option [Member]                                      
Stock Issued During Period, Value, New Issues             $ 204,422 $ 393,750   $ 393,750                  
Proceeds from Issuance or Sale of Equity, Total $ 358,312                     358,312 358,312            
Series A Convertible Preferred Stock [Member] | Private Placement [Member]                                      
Stock Issued During Period, Value, New Issues                       2,055,000 2,055,000            
Series C Convertible Preferred Stock [Member] | Private Placement [Member]                                      
Stock Issued During Period, Value, New Issues                       $ 1,300,000 $ 1,300,000            
Reverse Stock Split [Member]                                      
Stockholders' Equity Note, Stock Split, Conversion Ratio     25