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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cost of Goods Sold $ 35,000 $ 35,000
Property, Plant and Equipment, Useful Life         5 years    
Deferred Revenue, Current $ 1,099,000       $ 1,099,000  
Sales Allowances, Goods         342,000    
Payments of Sales Returns and Allowances, Goods         0    
Allowance for Sales Returns, Distributor Fees [Member]              
Sales Allowances, Goods         72,000    
Allowance for Sales Returns, Rebates and Chargebacks [Member]              
Sales Allowances, Goods         221,000    
Allowance for Sales Returns [Member]              
Sales Allowances, Goods         $ 49,000