CONSOLIDATED BALANCE SHEETS (Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
CONSOLIDATED BALANCE SHEETS (Unaudited)
Accounts receivable allowance	$ 259	$ 257
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	35,302,549	35,302,549
Common stock, shares outstanding (in shares)	34,345,656	34,242,581
Treasury stock, common shares (in shares)	956,893	1,059,968