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Note 9 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Income taxes computed at the statutory rate on pretax income         $ 1,303 $ 1,236
Tax exempt income         (408) (498)
Cash surrender value income         (75) (83)
Tax credit         (27) (25)
Change in corporate tax rate         348
Other         8 11
Total income tax expense $ 150 $ 175 $ 836 $ 910 $ 1,149 $ 641