Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Financial Instruments - Assets and Liabilities Measured at Fair Value (Details)

v3.8.0.1
Note 11 - Financial Instruments - Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
Available-for-sale Securities $ 0 $ 0
Fair Value, Measurements, Recurring [Member]    
Available-for-sale Securities
Total 49,050 65,031
Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member]    
Cash equivalents 49,050 65,031
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale Securities
Total 49,050 65,031
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member]    
Cash equivalents 49,050 65,031
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Available-for-sale Securities
Total
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member]    
Cash equivalents