Investments - Investment Activity (Detail) (USD $)	12 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Marketable Securities Gain Loss [Abstract]
Realized losses on sale of trading securities	$ (244,627)	$ (2,638)
Trading securities, at cost	5,457,989	5,960,634	5,963,272
Trading securities, at fair value	4,758,220	5,216,139	5,703,916
Net change in unrealized gains (losses) on trading securities (included in earnings)	44,728	(485,139)	631,192
Available-for-sale securities, at cost	8,064,902	8,117,844	3,081,439
Available-for-sale securities, at fair value	9,053,111	8,824,311	4,660,928
Gross realized gains on sale of available-for-sale securities	265,641	179,379	139,458
Gross unrealized gains recorded in shareholders' equity	1,289,689	951,631	1,596,949
Gross unrealized losses recorded in shareholders' equity	(301,480)	(245,164)	(17,460)
Losses on available-for-sale securities deemed to have other-than-temporary declines in value	$ (47,459)	$ (19,073)	$ (3,699)

Available for sale securities gross unrealized gains recorded in shareholders equity.

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Available for sale securities gross unrealized losses recorded in shareholders equity.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period. Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and the change in net unrealized holding gain (loss) is included in earnings for the period.

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