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Note 6 - Leases (Details Textual)
1 Months Ended 9 Months Ended
Jul. 31, 2019
USD ($)
a
Feb. 29, 2016
USD ($)
a
Sep. 30, 2019
USD ($)
Operating Lease, Cost     $ 86,000
SoCal Hemp JV LLC [Member]      
Equity Method Investment, Ownership Percentage 50.00%    
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  
Annual Expected Sublease Income, Year One     420,000
Annual Expected Sublease Income, Year Three     420,000
Annual Expected Sublease Income, Year Four     420,000
Annual Expected Sublease Income, Year Two     420,000
Annual Expected Sublease Income, Year Five     $ 420,000
SoCal Hemp JV LLC [Member]      
Area of Real Estate Property | a 1,280    
Lessee, Operating Lease, Term of Contract 5 years    
Lessee, Operating Lease, Number of Renewals 3    
Lessee, Operating Lease, Renewal Term 5 years    
Lessee, Operating Lease Rental Expense Per Acre of Leased Property $ 500,000    
Minimum [Member]      
Lessee, Lease, Remaining Term     1 year
Maximum [Member]      
Lessee, Lease, Remaining Term     2 years
Maximum [Member] | SoCal Hemp JV LLC [Member]      
Area of Real Estate Property | a 9,600