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Note 1 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended 178 Months Ended
Nov. 29, 2016
USD ($)
Oct. 27, 2016
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Oct. 04, 2016
$ / shares
Common Stock, Shares, Outstanding | shares     4,564,428 208,258 4,564,428  
Common Stock, Par or Stated Value Per Share | $ / shares     $ 0.01 $ 0.01 $ 0.01 $ 0.01
Stockholders' Equity, Period Increase (Decrease)     $ 23,950,996      
Stock Issued During Period, Value, New Issues       $ 13,060,880    
Debt Instrument, Increase (Decrease), Net         $ 5,685,000  
Advertising Expense     71,212 8,220    
Research and Development Expense     406,000 261,000    
Depreciation     73,249 72,275    
Amortization of Intangible Assets     9,107 6,291    
Cash, Uninsured Amount     1,652,438   1,652,438  
Product Warranty Expense     $ 34,665 56,201    
Number of Operating Segments     1      
Non-US [Member]            
Revenues     $ 0 $ 0    
Earliest Tax Year [Member]            
Open Tax Year     2013      
IPO [Member]            
Stock Issued During Period, Value, New Issues         13,555,003  
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  
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