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Note 1 - Organization and Description of Business (Details Textual) - USD ($)
12 Months Ended 19 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2017
Largest Customer [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]        
Concentration Risk, Percentage 56.00% 88.00%    
Largest Customer [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]        
Concentration Risk, Percentage 0.00% 90.00%    
AMIRON Products [Member] | One Customer [Member]        
Supply Commitment, Agreement Period     5 years  
Revenue, Net (Deprecated 2018-01-31)       $ 5
Supply Commitment, Agreement Period After Extension     5 years  
Supply Commitment, Additional Amount the Customer May Elect Upon Extension     $ 8,000,000  
Supply Commitment, Purchase Order Delivery Term Upon Extension     2 years