Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)		1 Months Ended		12 Months Ended
	Jan. 09, 2013	Nov. 30, 2014	Jan. 31, 2002	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2013	May. 31, 1988
General and Administrative Expense [Member]
Share-based Compensation				$ 1,100,000	$ 1,100,000	$ 500,000
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
Net Income (Loss) Attributable to Parent				$ (24,013,000)	(18,881,000)	(22,677,000)
Working Capital				1,200,000
Net Cash Provided by (Used in) Operating Activities				$ (12,568,000)	(10,121,000)	$ (15,767,000)
Shelf Registration Value							$ 40,000,000
Proceeds from Issuance of Common Stock		$ 14,600,000			14,523,000
Stock Issued During Period, Shares, New Issues		1,435,713
Shares Issued, Price Per Share		$ 10.1751
Share-based Compensation	$ 373,000			$ 1,116,000	$ 1,077,000	$ 516,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				0
Weighted Average Number Diluted Shares Outstanding Adjustment				8,453,000	8,237,000	7,012,000
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%
Stock Issued During Period, Value, Conversion of Convertible Securities				$ 1,006,000	311,000
Stock Issued During Period, Shares, Conversion of Convertible Securities				126,633
Income Taxes Paid				$ 4,000	$ 4,000	$ 5,700