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Shareholders' Equity - Additional Information (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended | 18 Months Ended |  |  | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2014 1989 Plan [Member] | Jun. 30, 2014 1997 Plan [Member] | Jun. 30, 2013 1997 Plan [Member] | Jun. 30, 2012 1997 Plan [Member] | Jun. 30, 2014 Employees [Member] | Jun. 30, 2013 Employees [Member] | Jun. 30, 2012 Employees [Member] | Jun. 30, 2014 Common Class A [Member] | Jun. 30, 2013 Common Class A [Member] | Jun. 30, 2012 Common Class A [Member] | Jun. 30, 2014 Common Class A [Member] 1989 Plan [Member] | Jun. 30, 2012 Common Class A [Member] Employees [Member] | Jun. 30, 2014 Common Class A [Member] Director [Member] | Jun. 30, 2013 Common Class A [Member] Director [Member] | Jun. 30, 2012 Common Class A [Member] Director [Member] | Jun. 30, 2014 Common Class C [Member] | Jun. 30, 2014 Share Repurchase Plan, December 2012 and Renewal, December 2013 [Member] Common Class A [Member] | Dec. 07, 2012 Share Repurchase Plan - December 2012 [Member] | Jun. 30, 2014 Share Repurchase Renewal, December 2013 [Member] | Dec. 31, 2014 Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.005
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,750,000 |  |
Remaining authorized repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,570,000 |
Class A common stock purchased | 93,351 | 55,052 |  |  |  |  |  |  |  |  |  | 93,351 | 55,052 |  |  |  |  |  |  |  |  |  |  |
Repurchasing amount | 289,000 | 174,000 | 0 |  |  |  |  |  |  |  |  | 289,000 | 174,000 |  |  |  |  |  |  |  | 463,000 |  |  |
Number of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 148,403 |  |  |
Class A common stock granted (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,600 | 3,600 | 3,600 | 3,600 |  |  |  |  |
Class A common stock granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.73 | $ 3.07 | $ 4.16 | $ 6.65 |  |  |  |  |
Conversion of shares of class C common stock for class A common stock, Shares |  |  |  |  |  |  |  |  |  |  |  | 1,340 | 2,516 | 60 |  |  |  |  |  |  |  |  |  |
Conversion ratio, shares converted (per share) |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio, shares issued as a result of stock conversion (per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of shares authorized under Stock Option Plan |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |  |  |
Annual award vesting, percentage |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |
Number of options outstanding | 22,000 | 29,000 | 29,000 | 25,300 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options issued under Stock Option Plan expiration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Stock Options Granted | 0 | 0 | 5,000 |  |  | 0 | 0 | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options Granted Under 1997 Plan, Fair Value |  |  |  |  |  |  |  | $ 8,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 6 months |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility factor based on historical volatility |  |  | 49.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate |  |  | 2.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected life |  |  | 5 years 8 months 1 day |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable | 22,000 |  |  |  |  |  |  |  | 22,000 | 25,000 | 22,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price (in dollars per share) | $ 18.72 |  |  |  |  |  |  |  | $ 18.72 | $ 18.71 | $ 19.21 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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