CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts (in dollars)	$ 100,000	$ 100,000
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	5,710,000	5,468,000
Common stock, shares outstanding	5,710,000	5,468,000