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Note 2 - Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 12 Months Ended
Apr. 15, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Reverse Stock Split [Member] | Subsequent Event [Member]          
Stockholders' Equity Note, Stock Split, Conversion Ratio 8        
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Four Customers [Member]          
Concentration Risk, Percentage       87.00%  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Two Customers [Member]          
Concentration Risk Number of Customers         2
Concentration Risk, Percentage         91.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]          
Concentration Risk Number of Customers       4  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Customers [Member]          
Concentration Risk, Percentage   86.00% 93.00% 86.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Concentration Risk Number of Customers       3  
Medical Equipment, Sales Demos [Member]          
Property, Plant and Equipment Estimated Useful Lives1       5 years  
Maximum [Member]          
Property, Plant and Equipment Estimated Useful Lives1       7 years  
Minimum [Member]          
Property, Plant and Equipment Estimated Useful Lives1       3 years  
Number of Financial Institutions       1  
Allowance for Doubtful Accounts Receivable       $ 0 $ 0
Warranty Period   1 year   1 year