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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Trade accounts receivable, allowance for doubtful accounts $ 334 $ 317
Preferred stock, par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 40,000,000 40,000,000
Common stock, shares issued (in shares) 20,513,344 20,373,519
Common stock, shares outstanding (in shares) 16,080,749 15,959,984
Treasury stock, shares (in shares) 4,432,595 4,413,535