Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)				1 Months Ended			12 Months Ended
	Nov. 29, 2016	Apr. 28, 2016	Jan. 01, 2002	Dec. 31, 2016	Nov. 30, 2016	Apr. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May 31, 1988
Net Income (Loss) Attributable to Parent							$ (26,339,000)	$ (24,013,000)	$ (18,881,000)
Working Capital				$ 11,000,000			11,000,000
Cash and Cash Equivalents, at Carrying Value				12,172,000			12,172,000	2,690,000	16,206,000	$ 11,887,000
Net Cash Provided by (Used in) Operating Activities							(9,514,000)	(12,568,000)	(10,121,000)
Share-based Compensation							$ 1,296,000	$ 1,116,000	$ 1,077,000
Weighted Average Number Diluted Shares Outstanding Adjustment							11,070,000	8,453,000	8,237,000
Goodwill				$ 3,813,000			$ 3,813,000	$ 3,813,000			$ 7,006,000
Goodwill Amortized Portion			$ 3,193,000
Percentage of Future Quarterly Interest Payments				50.00%			50.00%
Interest Payments in Stock							$ 434,000
Debt Instrument, Unamortized Discount				$ 10,572,000			10,572,000	7,564,000
Stock Issued During Period, Value, Conversion of Convertible Securities							$ 9,580,000	1,006,000	$ 311,000
Stock Issued During Period, Shares, Conversion of Convertible Securities							1,406,723
Income Taxes Paid							$ 4,000	4,000	4,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount							0
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
Land Improvements and Buildings [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life							10 years
Land Improvements and Buildings [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life							45 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life							5 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life							15 years
General and Administrative Expense [Member]
Share-based Compensation							$ 1,300,000	$ 1,100,000	1,100,000
Shares Issued Pursuant to Shelf Takedown [Member]
Stock Issued During Period, Value, New Issues				$ 10,600,000			$ 10,510,000		$ 14,457,000
Stock Issued During Period, Shares, New Issues				1,150,000
Shares Issued, Price Per Share				$ 9.75			$ 9.75
Shares Issued to Lenders [Member]
Stock Issued During Period, Value, New Issues							$ 6,086,000
Stock Issued During Period, Shares, New Issues	357,500				357,500		46,236
Debt Instrument, Unamortized Discount	$ 3,400,000				$ 3,400,000
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%
Debt Instrument, Unamortized Discount		$ 2,000,000
Debt Instrument, Convertible, Beneficial Conversion Feature		$ 1,480,000				$ 1,480,000