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Note 1 - Summary of Accounting Policies - Changes in Allowances for Uncollectible Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Balance at beginning of year $ 2,119 $ 2,226 $ 2,282
Acquisitions and other 52 3 4
Provision charged to expense 416 8 496
Write-offs, net of recoveries (181) (118) (556)
Balance at end of year $ 2,406 $ 2,119 $ 2,226