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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Trade, allowance $ 549 $ 1,611 $ 1,477 $ 1,157
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01    
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000    
Preferred stock, shares issued (in shares) 0 0    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01    
Common stock, shares authorized (in shares) 40,000,000 40,000,000    
Common stock, shares issued (in shares) 11,497,471 11,474,096    
Common stock, shares outstanding (in shares) 7,116,661 7,423,115    
Treasury stock, shares (in shares) 4,380,810 4,050,981