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Note 6 - Long-term Debt and Lease Obligation (Details Textual)
1 Months Ended 12 Months Ended
May 25, 2017
USD ($)
$ / shares
shares
Apr. 26, 2016
USD ($)
Feb. 08, 2016
USD ($)
a
May 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Mar. 17, 2019
Dec. 31, 2015
$ / shares
Convertible Debt, Total         $ 71,000,000      
Debt Instrument, Convertible, Difference Between Fair Value and Carrying Value         $ 42,200,000      
Debt Instrument, Convertible, Conversion Price | $ / shares $ 6.75       $ 6.75      
Share Price | $ / shares         $ 10.30      
Debt Instrument, Maturity Date, Percentage of Conversion Rate, 120.00%              
Gain (Loss) on Extinguishment of Debt, Total         $ (3,501,000)    
Debt Instrument, Unamortized Discount, Total         4,778,000 $ 8,988,000    
Long-term Debt, Total         155,494,000      
Subsequent Event [Member]                
Convertible Debt, Option Agreements, Percentage             95.00%  
Fenner Valley Farms LLC [Member]                
Lease Term     99 years          
Area of Real Estate Property | a     2,100          
Long-term Debt, Total     $ 12,000,000          
Termination Period After Lease Effective Date     20 years          
Lease Compounded Annual Return, Percentage     10.00%          
Minimum Future Payments from Leases Held for Investment     $ 14,400,000          
Reimbursement of Water Related Infrastructure from Leased Property, Annual Percentage     8.00%          
Maximum Reimbursement of Pipeline Related Development Expenses from Leased Property     $ 3,000,000          
Leased Property, Sale Price     1          
Legal Fees     $ 490,000          
Warrants [Member] | Interest Expense [Member]                
Unrealized Gain (Loss) on Derivatives         1,500,000      
2017 Warrants [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 362,500              
Warrants and Rights Outstanding $ 2,900,000              
Warrant Term 5 years              
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 14.94              
Senior Secured Debt [Member]                
Debt Instrument, Fee Amount $ 60,000,000              
Debt Instrument, Additional Amount after Refinance 15,000,000     $ 15,000,000        
Debt Instrument, Maturity Date, Minimum Principal Outstanding Amount $ 10,000,000       $ 10,000,000      
Debt Instrument, Maturity Date, Percentage of Conversion Rate,         120.00%      
Debt Instrument, Payment-in-kind Rate 6.00%              
Debt Instrument, Cash Rate 2.00%              
Upfront Fee, Recorded as Additional Debt Discount, Percentage 2.00%              
Long-term Debt, Total         $ 66,100,000      
Senior Secured Debt [Member] | Legal and Finders fees [Member]                
Debt Instrument, Unamortized Discount, Total $ 1,500,000              
Prior Senior Secured Debt [Member]                
Extinguishment of Debt, Amount 45,000,000     $ 45,000,000        
Gain (Loss) on Extinguishment of Debt, Total $ (3,500,000)              
2020 Convertible Senior Notes [Member]                
Debt Instrument, Convertible, Conversion Price | $ / shares         $ 6.75      
Debt Instrument, Interest Rate, Stated Percentage 7.00%       7.00%      
2020 Convertible Senior Notes [Member] | Investors [Member]                
Debt Instrument, Convertible, Conversion Price | $ / shares               $ 6.75
Debt Instrument, Fee Amount   $ 400,000            
Debt Instrument, Interest Rate, Stated Percentage   7.00%            
Debt Instrument, Unamortized Discount, Total   $ 2,000,000            
Unsecured Debt, Total   10,000,000            
Proceeds from Issuance of Debt   8,000,000            
Debt Instrument, Convertible, Beneficial Conversion Feature   $ 1,480,000            
Measurement Input, Price Volatility [Member]                
Embedded Derivative Liability, Measurement Input         0.4