Condensed Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	2,500,000	2,500,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	7,739,255	7,827,651
Common stock, shares outstanding	7,739,255	7,816,944
Treasury stock, shares outstanding		10,707
Class A Common Stock [Member]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	2,500,000	2,500,000
Common stock, shares issued
Common stock, shares outstanding
Class B Common Stock [Member]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	7,500,000	7,500,000
Common stock, shares issued
Common stock, shares outstanding