Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Consolidated Balance Sheets [Abstract]    
Trade accounts receivable, allowance for doubtful accounts $ 136,000 $ 106,000
Preferred stock, par value $ 1.00 $ 1.00
Preferred stock, shares authorized 3,000,000 3,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.05 $ 0.05
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 9,158,438 8,973,708
Common stock, shares outstanding 9,158,438 8,973,708