Note 1 - Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended				6 Months Ended
	Jul. 02, 2021	Jun. 07, 2021	May 18, 2021	May 31, 2017	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Net Income (Loss) Attributable to Parent, Total					$ (11,562)	$ (5,944)	$ (4,793)	$ (20,514)	$ (17,506)	$ (25,307)
Working Capital					10,100				10,100
Net Cash Provided by (Used in) Operating Activities, Total									(5,999)	(7,019)
Gain (Loss) on Extinguishment of Debt, Total									0	(12,394)
Proceeds from Issuance of Common Stock									30,354	3,923
Payments to Acquire Property, Plant, and Equipment, Total									20,177	4,712
Repayments of Long-term Debt, Total									27	$ 23
Interest Paid, Excluding Capitalized Interest, Operating Activities									819
Debt Instrument, Extension Option Fee Percentage			1.00%
Senior Secured Debt [Member]
Debt Instrument, Face Amount				$ 60,000
Debt Instrument, Additional Amount after Refinance				15,000
Debt Instrument, Extension Option Fee Percentage			1.00%
Prior Senior Secured Debt [Member]
Extinguishment of Debt, Amount				$ 45,000
Pipelines [Member]
Payments to Acquire Property, Plant, and Equipment, Total									19,000
Lenders [Member]
Stock Issued During Period, Shares, Payment of Debt Extension Fees (in shares)			64,356
Subsequent Event [Member]
Deposits, Segregated Account, Pre-fund Eight Quarterly Dividend Payments	$ 10,200
Subsequent Event [Member] | Senior Secured Debt [Member]
Repayments of Long-term Debt, Total	77,500
Subsequent Event [Member] | New Loan [Member]
Debt Instrument, Face Amount	$ 50,000
Subsequent Event [Member] | Depository Shares [Member]
Stock Issued During Period, Shares, New Issues (in shares)	2,000,000
Preferred Stock, Shares Per Depository Share (in dollars per share)	$ 0.001
Preferred Stock, Liquidation Preference Per Share (in dollars per share)	25.00
Subsequent Event [Member] | Series A Preferred Stock [Member]
Preferred Stock, Liquidation Preference Per Share (in dollars per share)	$ 25,000.00
Proceeds From Issuance of Preferred Stock, Net of Issuance Costs	$ 54,000
July 2020 ATM Offering [Member]
At Market Issuance Sales Agreement, Maximum Aggregate Offering Price					30,000				$ 30,000
July 2020 ATM Offering [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	2,748,339
Proceeds From Issuance of Common Stock, Net of Issuance Costs	$ 29,200
At Market Issuance Sales Agreement [Member]
Stock Issued During Period, Value, New Issues					$ 1,413	$ 14,866		$ 3,923
At Market Issuance Sales Agreement [Member] | Subsequent Event [Member]
Stock Issued During Period, Value, New Issues	$ 30,000
Private Placement [Member] | Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		1,219,512
Shares Issued, Price Per Share (in dollars per share)		$ 12.30
Proceeds from Issuance of Common Stock		$ 15,000
Over-Allotment Option [Member] | Subsequent Event [Member] | Depository Shares [Member] | Maximum [Member]
Stock Issued During Period, Shares, New Issues (in shares)	300,000
SoCal Hemp JV LLC Lease Agreement [Member]
Equity Method Investment, Ownership Percentage					50.00%				50.00%
Conversion of Convertible Senior Notes 2020 into Preferred Stock [Member]
Gain (Loss) on Extinguishment of Debt, Total									$ (12,400)