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Note 1 - Summary of Significant Accounting Policies (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]        
Depreciation $ 425,000 $ 369,000 $ 339,000  
Finite-Lived Patents, Gross 63,125      
Finite-Lived Intangible Assets, Accumulated Amortization $ 49,375 $ 41,500    
Finite-Lived Intangible Asset, Useful Life 10 years      
Shares, Outstanding 2,221,340 1,751,773 863,462  
Class of Warrant or Right, Outstanding 5,894,675 5,069,815 3,170,520 1,747,478
Minimum [Member]        
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life 3 years      
Maximum [Member]        
Note 1 - Summary of Significant Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life 7 years