Organization and Significant Accounting Policies - Stock based compensation and new or revised accounting standards (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Organization and Significant Accounting Policies
Increase in stock based compensation	$ 2,990	$ 12,596
Non controlling interest holding period	1 year
Deferred financing fees, net	$ 1,762,000	1,193,000
Mortgage notes and bonds payable, net	514,071,000	308,779,000
Crop Revenue	$ 799,000	$ 846,000