Stock-based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Stock based compensation expense	$ 123,112	$ 129,167
Deferred tax benefit related to stock based compensation	6,839	$ 11,606
Unrecognized compensation costs	$ 129,983
Period in which compensation cost will be recognized	2 years
Deferred tax benefit related to unrecognized compensation costs	$ 6,704
Outstanding	222,854	197,800
Vested and exercisable	135,249
Dividends paid per share	$ 1.00	$ 1.00
Aggregate intrinsic value of options exercised	$ 26,691	$ 20,769
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	$ 32,564	$ 34,136
Unrecognized compensation costs	31,923
Incentive Stock Options [Member]
Unrecognized compensation costs	$ 98,060
Stock Options [Member] \| 2017 Plan [Member]
Vesting period	2 years
Expiration period	10 years
Number of shares authorized	400,000
Granted	54,715
Outstanding	171,949
Vested and exercisable	135,249

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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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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 unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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