Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($)		1 Months Ended	9 Months Ended		12 Months Ended
	Apr. 28, 2016	Apr. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Feb. 08, 2016
2020 Convertible Senior Notes [Member] | Investors [Member]
Unsecured Debt	$ 10,000,000	$ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage	7.00%	7.00%
Proceeds from Issuance of Debt	$ 8,000,000	$ 8,000,000
Debt Instrument, Convertible, Beneficial Conversion Feature	$ 1,480,000		$ 1,500,000
Stock Issued During Period, Value, New Issues			224,854
Senior Secured Mortgage Loan [Member]
Debt Instrument, Face Amount			43,100,000
Senior Secured Debt [Member]
Percentage of Future Quarterly Interest Payments						50.00%
Debt Issuance Cost Reclassification from Other Long-term Assets to Long-term Debt [Member] | Year Ended December 31, 2015 [Member]
Prior Period Reclassification Adjustment					$ 626,000
Debt Issuance Cost Reclassification from Other Long-term Assets to Long-term Debt [Member]
Prior Period Reclassification Adjustment			539,000
Net Income (Loss) Attributable to Parent			(19,615,000)	$ (16,797,000)
Working Capital			(39,700,000)
Net Cash Provided by (Used in) Operating Activities			(6,410,000)	$ (9,433,000)
Stock Issued During Period, Value, New Issues			$ 2,250,000