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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, 2020
Jun. 30, 2019
Jun. 30, 2018
Balance at beginning of year $ 1,250 $ 1,590 $ 1,131
Acquisitions and other 192 66 (193)
Provision charged to expense 824 (48) 671
Write-offs, net of recoveries (153) (358) (19)
Balance at end of year $ 2,113 $ 1,250 $ 1,590