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Note 7 - Secured Notes to Related Party (Details Textual) - USD ($)				1 Months Ended	3 Months Ended								12 Months Ended
	Aug. 05, 2016	Aug. 02, 2016	Jul. 29, 2011	Apr. 30, 2011	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Convertible Debt Issuable in Connection with Private Placement				$ 4,500,000
Proceeds from Convertible Debt				$ 4,300,000
Common Shares Registered for Resale in Connection with Convertible Notes			3,500,000
Interest Expense, Debt, Excluding Amortization													$ 400,000	$ 300,000	$ 300,000
Amortization of Debt Discount (Premium)													689,000	624,000	573,000
Convertible Notes Payable, Related Parties, Current					$ 2,911,000				$ 2,222,000				2,911,000	2,222,000
Interest Expense					1,270,000	$ 886,000	$ 257,000	$ 251,000	247,000	$ 242,000	$ 237,000	$ 232,000	2,664,000	958,000	$ 887,000
Notes Payable, Related Parties, Noncurrent					50,000,000								50,000,000
Convertible Debt Securities [Member]
Debt Instrument, Interest Rate, Stated Percentage				6.00%
Debt Instrument Conversion Ratio Multiple of Principal				$ 1,000
Beneficial Ownership after Conversion				9.99%
Notice Period Associated with Beneficial Ownership Percentage Limitation Convertible Notes				61 days
Paid-in-Kind Interest													300,000
Debt Instrument, Increase (Decrease), Other, Net													300,000
Debt Instrument, Face Amount					6,000,000								6,000,000
Debt Instrument, Unamortized Discount					3,100,000								$ 3,100,000
Debt Instrument, Convertible, Number Shares of Equity Insturments													7,500,000
Convertible Debt Securities [Member] | In Case of Debt Conversion [Member]
Debt Instrument, Face Amount					6,000,000								$ 6,000,000
Convertible Debt Securities [Member] | Common Stock [Member]
Debt Instrument Conversion Ratio Shares				1,250
Term Loan [Member] | Tang Capital [Member]
Debt Instrument, Interest Rate, Stated Percentage		8.00%
Debt Agreement, Maximum Borrowing Capacity		$ 100,000,000
Debt Instrument, Term		2 years
Proceeds from Issuance of Long-term Debt	$ 50,000,000
Proceeds from Issuance of Long-term Debt, Subject to Achievement of Corporate Milestone		$ 50,000,000
Interest Expense													1,600,000
Notes Payable, Related Parties, Noncurrent					$ 50,000,000								$ 50,000,000

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