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Note 1 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 12 Months Ended 166 Months Ended 178 Months Ended 181 Months Ended
Feb. 22, 2017
USD ($)
Jan. 19, 2017
shares
Nov. 29, 2016
USD ($)
Oct. 27, 2016
Aug. 31, 2015
USD ($)
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Oct. 04, 2016
$ / shares
Common Stock, Shares, Outstanding | shares           6,489,428   4,564,428   4,564,428 6,489,428  
Common Stock, Par or Stated Value Per Share | $ / shares           $ 0.01   $ 0.01   $ 0.01 $ 0.01 $ 0.01
Stockholders' Equity, Period Increase (Decrease)           $ 27,765,934            
Stock Issued During Period, Value, New Issues           3,421,188            
Proceeds from Issuance or Sale of Equity         $ 13,800,000              
Debt Instrument, Increase (Decrease), Net                     $ 5,685,000  
Advertising Expense           4,271 $ 3,996          
Research and Development Expense           84,472 122,161          
Depreciation           15,685 19,207          
Amortization of Intangible Assets           2,888 1,832          
Income Tax Expense (Benefit)           $ 0            
Valuation Allowance Percentage           100.00%            
Unrecognized Tax Benefits           $ 0         0  
Cash, Uninsured Amount           1,866,875         1,866,875  
Product Warranty Expense           $ 4,343 $ 29,889          
Number of Operating Segments           2            
Earliest Tax Year [Member]                        
Open Tax Year           2013            
IPO [Member]                        
Stock Issued During Period, Value, New Issues                 $ 13,555,003   3,421,188  
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    
Proceeds from Issuance or Sale of Equity     $ 1,983,337                  
Over-Allotment Option [Member]                        
Stock Issued During Period, Value, New Issues           $ 393,750            
Proceeds from Issuance or Sale of Equity $ 358,312                      
Sale of Stock, Underwriter Option, Maximum Additional Shares of Common Stock Available for Purchase | shares   175,000                    
Sale of Stock, Underwriter Option, Number of Securities Called by Maximum Additional Warrants Available for Purchase | shares   35,000                    
Series A Convertible Preferred Stock [Member] | Private Placement [Member]                        
Stock Issued During Period, Value, New Issues                     $ 2,055,000  
Reverse Stock Split [Member]                        
Stockholders' Equity Note, Stock Split, Conversion Ratio       25