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Note 6 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Sep. 30, 2015
Short Term Investment Minimum     $ 2,000
Payment Terms, Severance Compensation   1 year  
Potential Severance Cost for Chief Operating Officer [Member]      
Loss Contingency, Estimate of Possible Loss $ 320 $ 320  
Litigation Related to Strategic Advisory Services [Member]      
Loss Contingency, Damages Sought, Value 1,000    
Loss Contingency Accrual $ 0 $ 0  
Minimum [Member]      
Period Of Warranty On Products   1 year  
Maximum [Member]      
Period Of Warranty On Products   2 years