Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
CONSOLIDATED BALANCE SHEETS
Trade accounts receivable, allowance for doubtful accounts	$ 67,000	$ 78,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	12,000,000	12,000,000
Common stock, shares issued	9,008,855	8,983,374