Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Condendsed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance	$ 28,000	$ 28,000
Land, buildings and equipment, accumulated depreciation	$ 26,028,680	$ 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	4,241,370	4,238,430
Common stock, shares outstanding	4,241,370	4,238,430