Incentive Plans Incentive Plans: (Narrative) (Details)	12 Months Ended
Jun. 30, 2019 USD ($) plan $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans \| plan	3
Share-based compensation expense \| $	$ 869,000	$ 1,100,000
Income tax benefit recognized for share-based compensation plans \| $	$ (147,000)	$ (206,000)
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock	10,595,259	10,611,689
2013 Equity Incentive Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	300,000
Annual limitation on awards granted to an individual under Equity Incentive Plan	60,000
2013 Equity Incentive Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	300,000
Annual limitation on awards granted to an individual under Equity Incentive Plan	45,000
Equity Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted, weighted average grant date fair value \| $ / shares	$ 20.19	$ 0
Stock options, Exercised	48,250	83,750
Stock options, Granted	90,000	0
Stock options, Forfeitured	0	2,500
Equity Incentive Plans \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term for stock awards	10 years
Term used to calculate expected volatility	84 months
Stock options, Exercised	48,250	83,750
Stock options, Granted	90,000	0
Stock options, Forfeitured	0	2,500
Number of shares available for grant	57,500	147,500
Unrecognized share-based compensation expense, stock options \| $	$ 292,000	$ 409,000
Share-based compensation cost not yet recognized, weighted average period for recognition (less than)	3 years 4 months 24 days	10 months
Forfeiture rate for Equity Incentive Plans	20.00%	20.00%
Expected term	7 years 6 months	0 years
Expected volatility	16.50%	0.00%
Equity Incentive Plans \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years 10 months 24 days	10 months
Number of shares available for grant	43,250	267,750
Forfeiture rate for Equity Incentive Plans	20.00%	20.00%
Restricted stock, Vesting and distribution	89,500	10,500
Restricted stock, Forfeited	0	2,000
Restricted stock, grants in period	224,500	0
Unrecognized share-based compensation expense, restricted stock \| $	$ 4,200,000	$ 409,000
Restricted stock, Fair value of shares vested and distributed \| $	$ 1,600,000	$ 194,000
2010 Equity Incentive Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	586,250
Annual limitation on awards granted to an individual under Equity Incentive Plan	117,250
2010 Equity Incentive Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	288,750
Annual limitation on awards granted to an individual under Equity Incentive Plan	43,312
2006 Equity Incentive Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	365,000
2006 Equity Incentive Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	185,000
Two years \| Equity Incentive Plans \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, award vesting percentage	50.00%
Four years \| Equity Incentive Plans \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock, award vesting percentage	50.00%

Share-based Compensation Arrangement by Share-based Payment Award, Annual Limitation on Awards Granted to an Individual

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Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumption, Term Used to Calculate Expected Volatility

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Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Rate

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Number of Share-based Compensation Plans

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Share-based Compensation Arrangment by Share-based Payment Award, Award Vesting Rights, Percentage

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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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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 share-based awards, other than options, awarded to employees as compensation.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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