Incentive Plans - Additional Information (Details) - USD ($)	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 1,300,000	$ 954,000
Equity Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, Exercised	132,000	16,250
Stock options, Granted	0	0
Stock options, Forfeited	5,500	0
Stock Options \| Equity Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term for stock awards	10 years	10 years
Term used to calculate expected volatility	84 months	84 months
Stock options, Exercised	132,000	16,250
Stock options, Granted	0	0
Stock options, Forfeited	5,500	0
Number of shares available for grant	60,500	57,500
Unrecognized share-based compensation expense, stock options	$ 114,000	$ 211,000
Share-based compensation cost not yet recognized, weighted average period for recognition (less than)	1 year 10 months 24 days	2 years 7 months 6 days
Forfeiture rate for equity incentive plans	20.00%	20.00%
Stock Options \| 2013 Equity Incentive Plan ("2013 Plan")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	300,000	300,000
Annual limitation on awards granted to an individual under Equity Incentive Plan	60,000	60,000
Stock Options \| 2010 Equity Incentive Plan ("2010 Plan")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	586,250	586,250
Annual limitation on awards granted to an individual under Equity Incentive Plan	117,250	117,250
Stock Options \| 2006 Equity Incentive Plan ("2006 Plan")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	365,000	365,000
Restricted Stock \| Equity Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year 10 months 24 days	2 years 10 months 24 days
Number of shares available for grant	62,750	51,250
Forfeiture rate for equity incentive plans	20.00%	20.00%
Restricted stock, grants in period	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 2,100,000	$ 0
Restricted stock, Forfeited	11,500	8,000
Restricted stock, Vesting and distribution	112,750	0
Unrecognized share-based compensation expense, restricted stock	$ 1,800,000	$ 3,200,000
Restricted Stock \| 2013 Equity Incentive Plan ("2013 Plan")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	300,000	300,000
Annual limitation on awards granted to an individual under Equity Incentive Plan	45,000	45,000
Restricted Stock \| 2010 Equity Incentive Plan ("2010 Plan")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	288,750	288,750
Annual limitation on awards granted to an individual under Equity Incentive Plan	43,312	43,312
Restricted Stock \| 2006 Equity Incentive Plan ("2006 Plan")
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for Equity Incentive Plan	185,000	185,000

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

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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 nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option 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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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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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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Number of shares authorized for issuance under share-based payment arrangement.

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

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