Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)				1 Months Ended	12 Months Ended
		Jan. 01, 2019	May 25, 2017	May 31, 2017	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2019	Nov. 30, 2018	Apr. 26, 2016	May 31, 1988
Net Income (Loss) Attributable to Parent, Total					$ (29,528,000)		$ (26,273,000)
Working Capital					11,300,000
Net Cash Provided by (Used in) Operating Activities, Total					(13,708,000)		(12,193,000)
Proceeds from Issuance of Common Stock					19,395,000		15,503,000
Required Payment to Acquire Property Available for Purchase, Due End of Fiscal Year					19,000,000
Share-based Payment Arrangement, Expense					$ 562,000		$ 473,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount					0
Weighted Average Number Diluted Shares Outstanding Adjustment, Total					11,477,000		11,398,000
Goodwill, Ending Balance					$ 3,813,000		$ 3,813,000					$ 7,006,000
Goodwill Amortized Portion					3,193,000
Goodwill, Impairment Loss					0
Equity Method Investments					729,000
Income (Loss) from Equity Method Investments, Total					$ (490,000)
Percentage of Future Quarterly Interest Payments					25.00%
Interest Payments in Stock					$ 1,370,000
Debt Conversion, Original Debt, Amount					$ 12,700,000
Stock Issued During Period, Shares, Conversion of Convertible Securities					1,918,444
Capital Expenditures Incurred but Not yet Paid					$ 3,200,000
Income Taxes Paid					6,000		6,000
Operating Lease, Right-of-Use Asset					59,000
Operating Lease, Liability, Total					59,000
Current Period Reclassification Adjustment		$ 865,000			865,000	[1]
Additional Paid-in Capital [Member]
Net Income (Loss) Attributable to Parent, Total
Current Period Reclassification Adjustment	[1]				2,896,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset		151,000
Operating Lease, Liability, Total		100,000
Reclassification of Warrant Liability to Additional Paid-in Capital [Member]
Current Period Reclassification Adjustment		865,000			30,000
Gains from Revaluating Warrants							1,500,000	$ 500,000
Reclassification of Warrant Liability to Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		2,000,000
Reclassification of Warrant Liability to Additional Paid-in Capital [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 2,000,000
Stage 1 Loan [Member]
Note Receivable, Interest Rate									8.00%
Financing Receivable, after Allowance for Credit Loss, Total									$ 377,000
SoCal Hemp JV LLC [Member]
Equity Method Investment, Ownership Percentage									50.00%
Equity Method Investments					729,000
Equity Method Investment, Contribution					741,000
Equity Method Investments, Capitalized Costs					162,000
Income (Loss) from Equity Method Investments, Total					(490,000)
Equity Method Investments, Accrued Contribution Expense					$ 315,000
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 Payment Arrangement, Expense					$ 600,000		$ 500,000
Senior Secured Debt [Member]
Debt Instrument, Face Amount				$ 60,000,000
Debt Instrument, Additional Amount after Refinance			$ 15,000,000	15,000,000
Debt Instrument, Interest Rate, Stated Percentage			3.00%
Prior Senior Secured Debt [Member]
Extinguishment of Debt, Amount			$ 45,000,000	$ 45,000,000
2020 Convertible Senior Notes [Member]
Debt Instrument, Face Amount											$ 27,400,000
Long-term Debt, Maturities, Repayments of Principal and Interest in Year Two					$ 65,500,000
Debt Instrument, Interest Rate, Stated Percentage					7.00%		7.00%				7.00%
At Market Issuance Sales Agreement [Member]
At Market Issuance Sales Agreement, Maximum Aggregate Offering Price										$ 25,000,000
Stock Issued During Period, Shares, New Issues					1,960,178
Proceeds from Issuance of Common Stock, Gross					$ 21,000,000
Proceeds from Issuance of Common Stock					$ 20,300,000

[1] A cumulative effect adjustment of $2,031 thousand was recognized as of January 1, 2019, upon adoption of ASU 2017-11.