Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)			1 Months Ended	12 Months Ended			192 Months Ended
	May 25, 2017	Jan. 01, 2002	May 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	May 31, 1988
Net Income (Loss) Attributable to Parent				$ (33,864,000)	$ (26,339,000)	$ (24,013,000)
Working Capital				7,000,000			$ 7,000,000
Net Cash Provided by (Used in) Operating Activities				(10,466,000)	(9,514,000)	(12,568,000)
Share-based Compensation				$ 2,304,000	$ 1,296,000	$ 1,116,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				0
Weighted Average Number Diluted Shares Outstanding Adjustment				10,894,000	11,070,000	8,453,000
Goodwill				$ 3,813,000	$ 3,813,000	$ 3,800,000	3,813,000	$ 7,006,000
Goodwill Amortized Portion		$ 3,193,000
Goodwill, Impairment Loss							$ 0
Interest Payments in Stock				433,000
Debt Conversion, Original Debt, Amount				$ 2,930,000
Stock Issued During Period, Shares, Conversion of Convertible Securities				413,335
Income Taxes Paid				$ 4,000	4,000	4,000
2017 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	362,500			362,500			362,500
Warrants and Rights Outstanding	$ 2,900,000			$ 2,900,000			$ 2,900,000
Shares Issued to Lenders [Member]
Stock Issued During Period, Shares, New Issues				29,706
Land, Buildings and Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life				10 years
Land, Buildings and Improvements [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				$ 2,300,000	$ 1,300,000	$ 1,100,000
Senior Secured Debt [Member]
Debt Instrument, Face Amount			$ 60,000,000
Debt Instrument, Additional Amount after Refinance	15,000,000		15,000,000
Percentage of Future Quarterly Interest Payments				25.00%			25.00%
Prior Senior Secured Debt [Member]
Extinguishment of Debt, Amount	$ 45,000,000		$ 45,000,000
Percentage of Future Quarterly Interest Payments				50.00%			50.00%