Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Allowance for credit losses	$ 125,000	$ 125,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	3,300,000	3,300,000
Common stock, shares outstanding	3,300,000	3,300,000