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Note 5 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash & cash equivalents:
Cash & cash equivalents	$ 57,353,567	$ 69,551,754
Money Market Funds [Member]
Cash & cash equivalents:
Cash & cash equivalents	57,353,567	69,551,754
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Cash & cash equivalents:
Cash & cash equivalents		3,000,000
Investments:
Investments	19,000,000	6,750,000
Certificates of Deposit [Member]
Cash & cash equivalents:
Cash & cash equivalents		3,000,000
Investments:
Investments	19,000,000	6,750,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investments:
Investments	3,007,370
Corporate Debt Securities [Member]
Investments:
Investments	3,007,370
Fair Value, Inputs, Level 2 [Member]
Cash & cash equivalents:
Cash & cash equivalents		72,551,754
Investments:
Investments	22,007,370
Cash & cash equivalents		72,551,754
Investments	$ 22,007,370	$ 6,750,000

X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Cash



-URI http://asc.fasb.org/extlink&oid=6506951



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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Cash Equivalents



-URI http://asc.fasb.org/extlink&oid=6507016

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- References

No definition available.

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- References

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- Definition

Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section 45



-Paragraph 1



-Subparagraph (f)



-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 45



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.2)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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