CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Undistributed Gains from Sales of Properties Net of Losses [Member]	Undistributed Losses from Operations [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2017	$ 19,859,966	$ 1,035,493	$ 24,076,991	$ 52,208,754	$ (57,120,991)	$ (340,281)
Balance (in shares) at Dec. 31, 2017		1,035,493				33,101
Net income (loss)	5,190,893			5,473,887	(282,995)
Stock options exercised, net of 1,600 re-load shares	91,895	$ 10,900	80,995
Stock options exercised, net of 1,600 re-load shares (in shares)		10,900
Dividend paid -$2.50 per share	(2,533,230)			(2,533,230)
Balance at Mar. 31, 2018	22,609,523	$ 1,046,393	24,157,986	55,149,411	(57,403,986)	$ (340,281)
Balance (in shares) at Mar. 31, 2018		1,046,393				33,101
Balance at Dec. 31, 2018	21,033,055	$ 1,046,393	24,157,986	54,642,765	(58,473,808)	$ (340,281)
Balance (in shares) at Dec. 31, 2018		1,046,393				33,101
Net income (loss)	(11,116)				(11,116)
Balance at Mar. 31, 2019	$ 21,021,939	$ 1,046,393	$ 24,157,986	$ 54,642,765	$ (58,484,924)	$ (340,281)
Balance (in shares) at Mar. 31, 2019		1,046,393				33,101