Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Consolidated Balance Sheets [Abstract]
Trade accounts receivable less allowances	$ 171,000	$ 79,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	12,000,000	12,000,000
Common stock, shares issued	9,338,191	9,254,580
Common stock, shares outstanding	9,338,191	9,254,580