Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Trade accounts receivable allowance for doubtful accounts	$ 326,000	$ 162,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	12,000,000	12,000,000
Common stock, shares issued	9,481,799	9,442,809
Common stock, shares outstanding	9,481,799	9,442,809