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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, 2021
Jun. 30, 2020
Jun. 30, 2019
Balance at beginning of year $ 2,113 $ 1,250 $ 1,590
Acquisitions and other 20 192 66
Provision charged to expense 605 824 (48)
Write-offs, net of recoveries (1,150) (153) (358)
Balance at end of year $ 1,588 $ 2,113 $ 1,250