Consolidated Balance Sheets (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts receivable, allowance for doubtful accounts	$ 693	$ 541
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	10,817,110	10,747,417
Common stock, shares outstanding (in shares)	10,817,110	10,747,417