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Note 14 - Debt (Details Textual)
1 Months Ended 12 Months Ended
Jun. 05, 2021
USD ($)
Apr. 15, 2021
USD ($)
Jul. 10, 2020
USD ($)
shares
Jan. 10, 2020
USD ($)
$ / shares
Apr. 19, 2017
$ / shares
Dec. 31, 2020
USD ($)
shares
Apr. 30, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Long-term Debt, Total           $ 1,254,000   $ 66,962,000 $ 1,254,000  
Interest Costs Incurred, Total               2,400,000 2,100,000 $ 2,700,000
Interest Costs Capitalized               1,200,000 0  
Finance Lease, Interest Costs Capitalized               900,000 0  
Gain (Loss) on Conversion of Notes to Common Stock               0 (1,916,000) $ 0
Conversion from Convertible 2020/21 Notes to Common Stock [Member]                    
Debt Conversion, Original Debt, Amount     $ 2,000,000.0     $ 12,700,000        
Debt Conversion, Converted Instrument, Shares Issued (in shares) | shares     4,169,426     5,672,654        
Gain (Loss) on Conversion of Notes to Common Stock                 $ (1,900,000)  
Conversion from Convertible 2020/21 Notes to Common Stock [Member] | Coupon Make Whole Payments [Member]                    
Debt Conversion, Original Debt, Amount     $ 300,000     $ 1,200,000        
Letter of Credit [Member]                    
Debt Instrument, Face Amount   $ 71,200,000                
The 2021 Bonds [Member]                    
Debt Instrument, Face Amount   $ 68,155,000                
Debt Instrument, Interest Rate, Stated Percentage   1.50%                
Debt Instrument, Unamortized Premium, Total   $ 800,000           600,000    
Debt Issuance Costs, Net, Total   3,000,000.0           $ 2,300,000    
SBA Loans [Member]                    
Proceeds from Issuance of Long-term Debt, Total             $ 1,000,000.0      
Debt Instrument, Decrease, Forgiveness   500,000                
SBA Loans [Member] | Agri-Energy [Member]                    
Debt Instrument, Decrease, Forgiveness   100,000                
Long-term Debt, Total   $ 300,000                
Debt Instrument, Periodic Payment, Total $ 8,000                  
Convertible 2017 Notes [Member]                    
Debt Instrument, Interest Rate, Stated Percentage         12.00%          
Convertible 2020 Notes [Member]                    
Debt Instrument, Interest Rate, Stated Percentage         12.00%          
Long-term Debt, Total       $ 14,100,000            
Debt Instrument, Interest Rate, Paid In Kind Percentage         2.00%          
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares         $ 14.72          
Debt Instrument, Convertible, Conversion Ratio         0.0679          
Beneficial Ownership Limitation, Percentage         4.99%          
Beneficial Ownership Limitation Percentage, Notice (Day)         61 days          
Beneficial Ownership Limitation After Notice, Percentage         9.99%          
Convertible 2020/21 Notes [Member]                    
Debt Instrument, Face Amount       $ 14,400,000            
Debt Instrument, Interest Rate, Stated Percentage       12.00%            
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares       $ 2.442            
Debt Instrument, Convertible, Conversion Ratio       0.4095            
Debt Instrument, PIK Interest       4.00%            
Debt Instrument, Conversion Price Reduction, Discount Rate       10.00%