Stock-based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Stock based compensation expense	$ 172,148	$ 123,112
Deferred tax benefit related to stock based compensation	9,404	$ 6,839
Unrecognized compensation costs	$ 199,969
Period in which compensation cost will be recognized	1 year 9 months
Deferred tax benefit related to unrecognized compensation costs	$ 11,004
Outstanding	259,164	222,854
Vested and exercisable	154,950
Dividends paid per share	$ 2.00	$ 1.00
Aggregate intrinsic value of options exercised	$ 67,328	$ 26,691
2017 Plan [Member] \| Non-employee Director [Member] \| Upper Range [Member]
Percentage of total number of shares subject to options or awards, single fiscal year	33.33%
Number of shares subject to option or award, single fiscal year	13,300
Number of shares authorized	133,000
2017 Plan [Member] \| Individual Employee [Member] \| Upper Range [Member]
Number of shares subject to option or award, single fiscal year	15,000
Non-qualified stock options [Member]
Stock based compensation expense	$ 44,780	$ 32,564
Unrecognized compensation costs	52,399
Incentive Stock Options [Member]
Unrecognized compensation costs	$ 147,570
Stock Options [Member] \| 2017 Plan [Member]
Vesting period	2 years
Expiration period	10 years
Number of shares authorized	400,000
Granted	110,304
Outstanding	154,950

Amount of deferred tax benefit attributable to unrecognized share-based compensation.

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The number of shares subject to option or award in a single fiscal year as outlined in the plan contract.

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The percentage of the total number of shares subject to options or awards granted in a single fiscal year; this will take effect only if the percentage is less than a specified amount in the plan contract.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Number of shares authorized for issuance under share-based payment arrangement.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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