Note 7 - Deerfield Loan (Details Textual) - Deerfield Loan [Member] $ in Millions	1 Months Ended	9 Months Ended
Jul. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015
Long-term Debt, Maturities, Repayments of Principal in Year Three		$ 12.5
Debt Instrument Repayment of Principal Portion Number of Installments		2
Long-term Debt, Maturities, Repayments of Principal in Year Two		$ 12.5
Deferred Period for Loan Payment		1 year
Debt Instrument, Threshold for Potential One-year Deferral, Market Capitalization		$ 250.0
Debt Instrument, Prepaid Interest	$ 5.0
Debt Instrument, Interest Rate, Stated Percentage		8.75%	8.75%
Early Repayment of Senior Debt	$ 2.5

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Amount of prepaid interest associated with a debt instrument.

+ References

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Refers to number of equal installments principal portion of the debt is payable.

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Represents the market capitalization used as a threshold for potential one-year deferral of installments to which the entity is subject with regard to the debt instrument.

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Refers to the deferred period for loan payment.

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