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Consolidated Statements Of Stockholders' Equity (USD $)
Common Stock [Member]
Additional Paid-In Capital [Member]
Total Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2011 $ 695,000 $ 105,727,000 $ 126,921,000 $ 343,000 $ (15,960,000) $ 217,726,000
Balance, shares at Dec. 31, 2011 69,473,000          
Net income     8,578,000     8,578,000
Unrealized loss on available for sale marketable securities, net of $128,000 of taxes       (173,000)   (173,000)
Comprehensive income           8,405,000
Exercise of stock options and other share-based compensation 1,000 1,660,000     179,000 1,840,000
Exercise of stock options and other share-based compensation, shares 158,000          
Tax benefit arising from stock option transactions   294,000       294,000
Share-based compensation expense - stock options   475,000       475,000
Treasury shares issued for Deferred Compensation Plan funding and redemptions (10,000 shares)   394,000     58,000 452,000
Shares issued pursuant to Employee Stock Plans 1,000 1,278,000     (29,000) 1,250,000
Shares issued pursuant to Employee Stock Plans, shares 70,000         70,000
Cash dividends - $.16 per common share     (10,847,000)     (10,847,000)
Shares issued pursuant to Dividend Reinvestment Plan (1,000 shares)   21,000     9,000 30,000
Balance at Mar. 31, 2012 $ 697,000 $ 109,849,000 $ 124,652,000 $ 170,000 $ (15,743,000) $ 219,625,000
Balance, shares at Mar. 31, 2012 69,701,000