Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Allowance for Credit Loss	$ 374	$ 406
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	11,445,187	11,445,187
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	55,000,000	55,000,000
Common stock, shares issued (in shares)	13,465,871	13,169,204
Common stock, shares outstanding (in shares)	13,465,871	13,169,204
Series A Preferred Stock [Member]
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares Issued (in shares)	0	0
Preferred stock, shares Outstanding (in shares)	0	0