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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Paid-in capital
Retained earnings
Accumulated other comprehensive loss
Beginning Balance at Dec. 31, 2010 $ 127,606 $ 121 $ 131,350 $ 1,312 $ (5,177)
Beginning Balance (in shares) at Dec. 31, 2010   12,065,000      
Comprehensive income:          
Net Income 14,066     14,066  
Translation adjustment (704)       (704)
Comprehensive income 13,362        
Shares issued to directors (Note G) (in shares)   21,000      
Shares issued to directors (Note G) 183   183    
Stock compensation expense (Note G) 2,612   2,612    
Issuance of common stock for acquisition of business (in shares)   256,000      
Issuance of common stock for acquisition of business 3,100 3 3,097    
Exercise of stock options (in shares) 123,500 89,000      
Exercise of stock options 225   225    
Dividends (Note G) (913)     (913)  
Ending Balance at Dec. 31, 2011 146,175 124 137,467 14,465 (5,881)
Ending Balance (in shares) at Dec. 31, 2011   12,431,000      
Comprehensive income:          
Net Income 20,947     20,947  
Translation adjustment 3,077       3,077
Derivative fair value adjustment (Note F) (272)       (272)
Effect of retirement benefit obligations (1,160)       (1,160)
Comprehensive income 22,592        
Shares issued to directors (Note G) (in shares)   23,000      
Shares issued to directors (Note G) 267   267    
Stock compensation expense (Note G) 2,526   2,526    
Issuance of common stock for acquisition of business (in shares)   144,000      
Issuance of common stock for acquisition of business 1,507 1 1,506    
Tax benefit (expense) on stock options, net 150   150    
Exercise of stock options (in shares) 199,823 156,000      
Exercise of stock options 576 3 573    
Dividends (Note G) (1,563)     (1,563)  
Ending Balance at Dec. 31, 2012 172,230 128 142,489 33,849 (4,236)
Ending Balance (in shares) at Dec. 31, 2012   12,754,000      
Comprehensive income:          
Net Income 9,281     9,281  
Translation adjustment (140)       (140)
Derivative fair value adjustment (Note F) 241       241
Effect of retirement benefit obligations 415       415
Comprehensive income 9,797        
Shares issued to directors (Note G) (in shares)   21,000      
Shares issued to directors (Note G) 277   277    
Stock compensation expense (Note G) 2,604   2,604    
Reduction of tax benefit from stock options, net (310)   (310)    
Exercise of stock options (in shares) 247,827 248,000      
Exercise of stock options 1,215 2 1,213    
Treasury Stock Repurchase (in shares)   (246,000)      
Treasury Stock Repurchase (3,229) (2)   (3,227)  
Dividends (Note G) (1,679)     (1,679)  
Ending Balance at Dec. 31, 2013 $ 180,905 $ 128 $ 146,273 $ 38,224 $ (3,720)
Ending Balance (in shares) at Dec. 31, 2013   12,777,000