Note 1 - Summary of Accounting Policies - Changes in Allowances for Uncollectible Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Balance at beginning of year	$ 2,406	$ 2,119	$ 2,226
Acquisitions and other	(169)	52	3
Provision charged to expense	870	416	8
Write-offs, net of recoveries	(137)	(181)	(118)
Balance at end of year	$ 2,970	$ 2,406	$ 2,119