Consolidated Balance Sheets (Current Period Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Allowance for accounts receivables	$ 128	$ 92
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000	20,000
Preferred stock, shares outstanding	500	500
Common stock, shares par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	21,587,336	21,587,336
Common stock, shares outstanding	21,587,336	21,587,336