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Note 1 - Organization and Description of Business (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended 19 Months Ended
Mar. 31, 2018
Jun. 30, 2018
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 100.00%   56.00% 88.00% 2016.00%  
Largest Customer [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]            
Concentration Risk, Percentage   0.00% 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