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Interim Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Stockholders' Equity:    
Common stock par value (in dollars per share) $ 0.10 $ 0.10
Common stock authorized (in shares) 20,000,000 20,000,000
Common stock outstanding (in shares) 11,737,993 11,662,688
Treasury stock (in shares) 72,600 42,600