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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ / shares in Thousands, $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Accounts receivable, allowance for doubtful accounts	$ 625	$ 693
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)	10,831,435	10,817,110
Common stock, shares outstanding (in shares)	10,831,435	10,817,110

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Face amount per share of no-par value common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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