CONDENSED CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Allowance for doubtful accounts (in dollars)	$ 100,000	$ 100,000
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	5,714,000	5,710,000
Common stock, shares outstanding	5,714,000	5,710,000