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Note 1 - Basis of Presentation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 02, 2021
Jun. 29, 2021
Jun. 07, 2021
May 18, 2021
May 31, 2017
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Jul. 01, 2021
Dec. 31, 2020
Net Income (Loss) Attributable to Parent, Total           $ (7,839) $ (11,562) $ (5,944) $ (4,493) $ (4,793) $ (20,514)   $ (25,345) $ (29,800)    
Working Capital           16,200             16,200      
Net Cash Provided by (Used in) Operating Activities, Total                         (9,643) (10,296)    
Gain (Loss) on Extinguishment of Debt, Total           (1,399)     0       (1,399) (12,394)    
Proceeds from Issuance of Common Stock                         32,459 9,808    
Payments to Acquire Property, Plant, and Equipment, Total                         21,094 5,103    
Repayments of Long-term Debt, Total                         77,559 $ 30    
Deposits, Segregated Account, Pre-fund Eight Quarterly Dividend Payments $ 10,200                              
Interest Paid, Excluding Capitalized Interest, Operating Activities                         1,700      
Debt Instrument, Extension Option Fee Percentage       1.00%                        
Dividends Payable, Current           1,449             1,449     $ 0
Accrual for Property and Equipment Received, Current           1,000             1,000      
Senior Secured Debt [Member]                                
Debt Instrument, Face Amount         $ 60,000                      
Debt Instrument, Additional Amount after Refinance         15,000                      
Repayments of Long-term Debt, Total 77,500                              
Debt Instrument, Extension Option Fee Percentage       1.00%                        
Prior Senior Secured Debt [Member]                                
Extinguishment of Debt, Amount         $ 45,000                      
New Loan [Member]                                
Debt Instrument, Face Amount $ 50,000                              
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 25.00                         $ 25.00  
Series A Preferred Stock [Member]                                
Stock Issued During Period, Value, New Issues           54,209                    
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                              
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                        
Apollo [Member]                                
Stock Issued During Period, Shares, New Issues (in shares) 299,210                              
July 2020 ATM Offering [Member]                                
At Market Issuance Sales Agreement, Maximum Aggregate Offering Price           30,000             $ 30,000      
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 $ 30,000         $ 2,103 $ 1,413 $ 14,866 $ 5,884   $ 3,923          
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] | 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)