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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Trade accounts receivable, allowance for doubtful accounts $ 328 $ 296 [1]
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 [1]
Common stock, shares authorized (in shares) 40,000,000 40,000,000 [1]
Common stock, shares issued (in shares) 20,163,756 20,053,335 [1]
Common stock, shares outstanding (in shares) 15,762,574 15,920,585 [1]
Treasury stock, shares (in shares) 4,401,182 4,132,750 [1]
[1] Effective January 1, 2019, the Company adopted Accounting Standards Codification Topic 842 (ASC 842), Leases. Prior period balances have been adjusted for the effects of the new standard. See Note 1 for further information.