Consolidated Balance Sheets (Current Period Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Allowance for accounts receivables	$ 355	$ 523
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	22,624,679	22,624,679
Common stock, shares outstanding	22,624,679	22,624,679