Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)			1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 05, 2020	May 25, 2017	May 31, 2017	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Nov. 30, 2018	May 31, 1988
Net Income (Loss) Attributable to Parent, Total						$ (37,817,000)	$ (29,528,000)
Working Capital					$ 4,900,000	4,900,000
Net Cash Provided by (Used in) Operating Activities, Total						(13,428,000)	(13,708,000)
Proceeds from Issuance of Common Stock						14,767,000	19,395,000
Required Payment to Acquire Property Available for Purchase, Due End of Fiscal Year					19,000,000	19,000,000
Share-based Payment Arrangement, Expense						$ 2,096,000	$ 562,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)						0
Weighted Average Number Diluted Shares Outstanding Adjustment, Total (in shares)						2,956,081	11,477,000
Goodwill, Ending Balance					3,813,000	$ 3,813,000	$ 3,813,000				$ 7,006,000
Goodwill Amortized Portion						3,193,000
Goodwill, Impairment Loss						0
Equity Method Investments					$ 1,354,000	1,354,000	729,000
Income (Loss) from Equity Method Investments, Total						$ (2,169,000)	(490,000)
Percentage of Future Quarterly Interest Payments					25.00%	25.00%
Interest Payments in Stock						$ 1,460,000
Income Taxes Paid						$ 7,000	6,000
Conversion of Series 1 Preferred Stock in to Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)						2,469
Conversion of Stock, Shares Issued (in shares)						1,000,068
Conversion of Convertible Senior Notes 2020 into Common Stock [Member]
Debt Conversion, Original Debt, Amount	$ 17,500,000					$ 38,900,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)	2,600,000
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares)						5,766,337
Conversion of Convertible Senior Notes into Series-1 Preferred Stock [Member]
Debt Conversion, Original Debt, Amount						$ 27,300,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)						10,000
Stage 1 Loan [Member]
Note Receivable, Interest Rate									8.00%
Financing Receivable, after Allowance for Credit Loss, Total									$ 190,000
SoCal Hemp JV LLC Lease Agreement [Member]
Equity Method Investment, Ownership Percentage									50.00%
Equity Method Investments					$ 1,400,000	$ 1,400,000	700,000
Equity Method Investment, Contribution						2,800,000
Income (Loss) from Equity Method Investments, Total						$ (2,200,000)
Land, Buildings and Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)						10 years
Land, Buildings and Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)						45 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)						5 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)						15 years
General and Administrative Expense [Member]
Share-based Payment Arrangement, Expense						$ 2,100,000	$ 600,000
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		7.00%
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
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Debt Conversion, Original Debt, Amount	$ 27,300,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)	10,000
Conversion of Convertible Senior Notes 2020 into Common Stock [Member]
Debt Conversion, Original Debt, Amount	$ 17,500,000
Debt Conversion, Converted Instrument, Shares Issued (in shares)	2,600,000
July 2020 ATM Offering [Member]
At Market Issuance Sales Agreement, Maximum Aggregate Offering Price								$ 30,000,000
Stock Issued During Period, Shares, New Issues (in shares)					1,099,021
Proceeds from Issuance of Common Stock, Gross					$ 11,200,000
Proceeds from Issuance of Common Stock					$ 10,800,000
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 (in shares)				2,369,170
Proceeds from Issuance of Common Stock, Gross				$ 25,000,000
Proceeds from Issuance of Common Stock				$ 24,200,000
SoCal Hemp JV LLC Lease Agreement [Member]
Equity Method Investment, Ownership Percentage					50.00%	50.00%