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CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net sales $ 83,196 $ 79,815 $ 76,138
Cost of goods sold 58,869 55,708 53,678
Gross profit 24,327 24,107 22,460
Selling, general and administrative expense 17,747 16,560 16,076
Write-down and loss on disposal of assets held for sale 1,162 1,135 500
Operating income 5,418 6,412 5,884
Interest income   358 336
Interest expense (479) (722) (914)
Income from continuing operations before income taxes 4,939 6,048 5,306
Provision for income taxes 1,415 2,544 1,867
Income from continuing operations 3,524 3,504 3,439
Discontinued operations, net of tax:      
Income (loss) from operations 3,800 4,169 (387)
Gain on disposal of discontinued operations 27,637    
Net income $ 34,961 $ 7,673 $ 3,052
Basic and diluted earnings (loss) per common share:      
Continuing operations $ 0.28 $ 0.28 $ 0.28
Discontinued operations:      
Income (loss) from operations $ 0.31 $ 0.34 $ (0.03)
Gain on disposal of discontinued operations $ 2.23    
Net income $ 2.82 $ 0.62 $ 0.25
Cash dividends per share $ 0.50 $ 0.50 $ 0.50
Basic and diluted weighted average shares outstanding 12,390 12,382 12,373