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Note 2 - Fair Value Measurement (Details Textual) - USD ($)
3 Months Ended
Oct. 12, 2016
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Measurements, Recurring [Member]      
Assets, Fair Value Disclosure   $ 0 $ 0
Immunetics [Member]      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 6,000,000    
Business Combination, Contingent Consideration Arrangement, Term of Milestone Achievement 3 years    
Business Combination, Contingent Consideration, Liability $ 3,400,000    
Immunetics [Member] | Contingent Purchase Price Consideration [Member]      
Fair Value Inputs, Discount Rate 4.40%    
GoutiFind Assay [Member]      
Contingent Consideration Arrangements, Liability, Write-off   901,000  
SpiroFind Assay [Member]      
Contingent Consideration Arrangements, Liability, Write-off   $ 551,000