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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Director
Employee
Common Stock
Common Stock
Director
Common Stock
Employee
Paid-in capital
Paid-in capital
Director
Paid-in capital
Employee
Retained earnings
Accumulated other comprehensive loss
Beginning Balance (in shares) at Dec. 31, 2013       12,777,000              
Balance at beginning of year at Dec. 31, 2013 $ 180,905     $ 128     $ 146,273     $ 38,224 $ (3,720)
Comprehensive (loss) income:                      
Net income 1,544                 1,544  
Translation adjustment (4,736)                   (4,736)
Derivative fair value adjustment (Note G) 13                   13
Effect of retirement benefit obligations (1,479)                   (1,479)
Comprehensive (loss) income (4,658)                    
Shares issued to employees/directors (Note H) (in shares)         23,000 5,000          
Shares issued to employees/directors (Note H)   $ 344 $ 2         $ 344 $ 2    
Stock compensation expense (Note H) 2,489           2,489        
Issuance of common stock for acquisition of business (in shares)       581,000              
Issuance of common stock for acquisition of business 8,382     $ 6     8,376        
Excess tax benefit from stock options, net $ 343           343        
Exercise of stock options (in shares) 365,223     326,000              
Exercise of stock options $ 2,491     $ 3     2,488        
Dividends (Note H) (2,065)                 (2,065)  
Ending Balance (in shares) at Dec. 31, 2014       13,712,000              
Balance at end of year at Dec. 31, 2014 188,233     $ 137     160,315     37,703 (9,922)
Comprehensive (loss) income:                      
Net income 12,278                 12,278  
Translation adjustment (5,281)                   (5,281)
Derivative fair value adjustment (Note G) (2)                   (2)
Effect of retirement benefit obligations 1,020                   1,020
Comprehensive (loss) income 8,015                    
Shares issued to employees/directors (Note H) (in shares)         28,000 189,000          
Shares issued to employees/directors (Note H)   416 1,657     $ 2   416 1,655    
Stock compensation expense (Note H) 2,689           2,689        
Reduction of tax benefit from stock options, net $ (138)           (138)        
Exercise of stock options (in shares) 110,375     101,000              
Exercise of stock options $ 844     $ 1     843        
Dividends (Note H) (2,248)                 (2,248)  
Ending Balance (in shares) at Dec. 31, 2015       14,030,000              
Balance at end of year at Dec. 31, 2015 199,468     $ 140     165,780     47,733 (14,185)
Comprehensive (loss) income:                      
Net income 15,720                 15,720  
Translation adjustment (22,683)                   (22,683)
Derivative fair value adjustment (Note G) 17                   17
Effect of retirement benefit obligations (148)                   (148)
Comprehensive (loss) income (7,094)                    
Shares issued to employees/directors (Note H) (in shares)         27,000 234,000          
Shares issued to employees/directors (Note H)   $ 421 $ 2,127     $ 3   $ 421 $ 2,124    
Stock compensation expense (Note H) 2,490           2,490        
Excess tax benefit from stock options, net $ 435           435        
Exercise of stock options (in shares) 272,325     265,000              
Exercise of stock options $ 2,353     $ 3     2,350        
Dividends (Note H) (2,472)                 (2,472)  
Ending Balance (in shares) at Dec. 31, 2016       14,556,000              
Balance at end of year at Dec. 31, 2016 $ 197,728     $ 146     $ 173,600     $ 60,981 $ (36,999)