Note 6 - Leases (Details Textual)	1 Months Ended	3 Months Ended
	Feb. 29, 2016 USD ($) a	Mar. 31, 2019 USD ($)
Operating Lease, Cost		$ 49,698
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 Two		420,000
Annual Expected Sublease Income, Year Three		420,000
Annual Expected Sublease Income, Year Four		420,000
Annual Expected Sublease Income, Year Five		$ 420,000
Minimum [Member]
Lessee, Lease, Remaining Term		1 year
Maximum [Member]
Lessee, Lease, Remaining Term		2 years