Marketable Securities (Gross Unrealized Losses And Fair Values Of Investments By Investment Category And Length Of Time) (Details) (USD $)	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value	$ 3,015,900	$ 36,180,425
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	(163)	(251,582)
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Market Value	2,590,240
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	(16,208)
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total	5,606,140	36,180,425
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(16,371)	(251,582)
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value	3,015,900	34,761,683
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses	(163)	(246,973)
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Fair Market Value	2,590,240
Marketable Securities, Continuous Unrealized Loss Position, 12 Months or Greater, Gross Unrealized Losses	(16,208)
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total	5,606,140	34,761,683
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total	(16,371)	(246,973)
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Market Value		1,418,742
Marketable Securities, Continuous Unrealized Loss Position, Less than 12 Months, Gross Unrealized Losses		(4,609)
Marketable Securities, Continuous Unrealized Loss Position, Fair Market Value, Total		1,418,742
Marketable Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses, Total		$ (4,609)

Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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Amount of unrealized loss on securities classified as available-for-sale.

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Paragraph 6

-Subparagraph (a)(1)

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Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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