CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)	12 Months Ended
	Dec. 31, 2018 USD ($) a $ / item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Supplemental Disclosure of Cash Flows:
Income taxes paid	$ 323,000	$ 334,000	$ 510,000
Income taxes refunded	204,000	958,000	133,000
Interest paid	8,419,000	7,060,000	6,779,000
Interest capitalized	0	215,000	0
Accrued and Other Liabilities	(4,357,411)	792,629	(29,492)
Land and Development Costs	$ 5,477,221	12,477,581	422,020
Supplemental disclosure of investing and financing activities
Annual surcharge, per round of golf played | $ / item	1
Minimum annual per round surcharge	$ 70,000
Maximum aggregate amount of per round surcharge	700,000
Contingent consideration on Golf Course Land Purchase reflected as an increase in increase in Golf Buildings, Improvements, and Equipment and also as an increase in Accrued and Other Liabilities	700,000
Non-cash decrease in long-term debt for buyer assumption of mortgage loan			23,100,000
Aspen, Colorado
Supplemental disclosure of investing and financing activities
Tenant contribution	1,500,000
Florida
Supplemental disclosure of investing and financing activities
Tenant contribution	1,900,000
Surface land over subsurface interests
Supplemental Disclosure of Cash Flows:
Gain on Sale	$ 435,000
Supplemental disclosure of investing and financing activities
Area of Land | a	455,000
Portfolio Sale | Sold
Supplemental disclosure of investing and financing activities
Portion of sales price not received in cash			23,100,000
Sales price			51,600,000
Non-cash decrease in long-term debt for buyer assumption of mortgage loan			23,100,000
Real Estate Operations
Supplemental disclosure of investing and financing activities
Purchase price	$ 106,636,566
Single-tenant | Aspen, Colorado
Supplemental disclosure of investing and financing activities
Purchase price	28,000,000
Land Sales
Supplemental Disclosure of Cash Flows:
Gain on Sale	32,596,000	$ 31,758,000	$ 8,304,000
Land Sales | Mitigation Bank West of Interstate Ninety Five
Supplemental Disclosure of Cash Flows:
Gain on Sale	18,400,000
Gain on Sale, noncash	5,100,000
Investment in Joint Venture	6,800,000
Accrued and Other Liabilities	300,000
Land and Development Costs	$ 1,300,000