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Note 14 - Subsequent Event (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Nov. 12, 2019
Oct. 02, 2019
Sep. 30, 2019
Sep. 30, 2018
Payments to Acquire Equity Method Investments     $ 6,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     $ 19,932
Subsequent Event [Member] | Custom Biogenic Systems, Inc. [Member]        
Business Combination, Consideration Transferred, Total $ 15,000      
Payments to Acquire Businesses, Gross 11,000      
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 4,000      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 15,000      
Business Combination, Contingent Consideration Arrangements, Earn-out Period 5 years      
Subsequent Event [Member] | Sexton Biotechnologies [Member]        
Payments to Acquire Equity Method Investments   $ 1,500    
Equity Method Investment, Ownership Percentage   18.00%