Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance	$ 28,000	$ 28,000
Land, buildings and equipment, accumulated depreciation	$ 26,646,710	$ 25,538,147
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	4,269,546	4,238,430
Common stock, shares outstanding	4,269,546	4,238,430