Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Consolidated Condensed Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 598	$ 325
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	20,000	20,000
Common stock, shares issued	8,934	8,781
Common stock, shares outstanding	8,934	8,781

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

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Face amount or stated value per share of 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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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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