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Note 1 - Organization and Description of Business (Details Textual)
$ in Millions
1 Months Ended 3 Months Ended
Dec. 31, 2015
USD ($)
Mar. 31, 2017
USD ($)
Number of Major Customers   1
One Customer [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Concentration Risk, Percentage   84.00%
One Customer [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]    
Concentration Risk, Percentage   61.00%
One Customer [Member] | AMIRON Products [Member]    
Supply Commitment, Agreement Amount $ 5.0  
Supply Commitment, Purchase Order Delivery Term 1 year 180 days  
Revenue, Net   $ 4.4
Supply Commitment, Agreement Period 5 years  
Supply Commitment, Additional Amount the Customer May Elect Upon Extension $ 5.0  
Supply Commitment, Agreement Period After Extension 10 years