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Consolidated Statements of Shareholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Unearned Common Stock Issuances [Member]
Additional Paid-in Capital [Member]
Currency Translation Adjustment [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Noncontrolling Interest [Member]
Hectronic Asia [Member]
Hectronic Asia [Member]
Noncontrolling Interest [Member]
Hectronic Swiss [Member]
Hectronic Swiss [Member]
Noncontrolling Interest [Member]
Optokon [Member]
Optokon [Member]
Currency Translation Adjustment [Member]
Optokon [Member]
Noncontrolling Interest [Member]
Eetrex [Member]
Eetrex [Member]
Additional Paid-in Capital [Member]
Eetrex [Member]
Noncontrolling Interest [Member]
Balance at May. 02, 2009 $ 234,901 $ 19,145 $ (3,632) $ 68,506 $ 15,675 $ (11,495) $ 143,577 $ 3,125                    
Balance, shares at May. 02, 2009   38,290,776                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Cancellation of shares pursuant to acquisition earn-out, shares   (239,695)                                
Cancellation of shares pursuant to acquisition earn-out 0 (120) 3,307 (3,187)                            
Release of restriction pursuant to acquisition earn-out 325   325                              
Earned portion of restircted stock awards, shares   62,140                                
Earned portion of restricted stock awards 0 31   (31)                            
Stock award and stock option amortization expense 871     871                            
Vested stock awards withheld for payroll taxes, shares   (10,923)                                
Vested stock awards withheld for payroll taxes (104) (5)   (99)                            
Exercise of options, shares   17,648                                
Exercise of options 185 9   176                            
Treasury shares issued for minority shares purchased, shares   30,000                                
Treasury shares issues for minority shares purchased (81) 15   (214)   118                        
Purchase of non-controlling interest in Hetronic Asia                 150 150                
Sale of minority interest in Hetronic Asia                 (324) (324)                
Tax expense from stock options (31)     (31)                            
Foreign currency translation adjustments 683       572     111                    
Net income/(Loss) for year 13,781           13,655 126                    
Cash dividends on common stock (10,414)           (10,414)                      
Balance at May. 01, 2010 239,942 19,075 0 65,991 16,247 (11,377) 146,818 3,188                    
Balance, shares at May. 01, 2010   38,149,946                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Earned portion of restircted stock awards, shares   47,600                                
Earned portion of restricted stock awards (22) 24   (46)                            
Stock award and stock option amortization expense 3,006     3,006                            
Vested stock awards withheld for payroll taxes, shares   (5,378)                                
Vested stock awards withheld for payroll taxes 0 (3)   3                            
Exercise of options, shares   150,075                                
Exercise of options 1,028 75   953                            
Treasury shares issued for minority shares purchased, shares   (30,000)                                
Treasury shares issues for minority shares purchased 0 (15)   15   0                        
Purchase of non-controlling interest in Hetronic Asia                     29 29       4,366 2,191 2,175
Sale of minority interest in Hetronic Asia                         (7,313) (4,057) (3,256)      
Foreign currency translation adjustments 11,244       10,962     282                    
Net income/(Loss) for year 19,193           19,500 (307)                    
Cash dividends on common stock (10,329)           (10,329)                      
Balance at Apr. 30, 2011 261,144 19,156 0 72,113 23,152 (11,377) 155,989 2,111                    
Balance, shares at Apr. 30, 2011   38,312,243                                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                    
Earned portion of restircted stock awards, shares   32,860                                
Earned portion of restricted stock awards (10) 18   (28)                            
Stock award and stock option amortization expense 3,976     3,976                            
Vested stock awards withheld for payroll taxes, shares   (1,400)                                
Vested stock awards withheld for payroll taxes 0 (2)   2                            
Exercise of options, shares   31,975                                
Exercise of options 263 16   247                            
Purchase of non-controlling interest in Hetronic Asia                               0 1,342  
Sale of minority interest in Hetronic Asia (615)             (615)                    
Foreign currency translation adjustments (7,589)       (7,579)     (10)                    
Net income/(loss) including mezzanine equity 8,419           8,383 36                    
Net income/(Loss) for year 8,137                                  
Cash dividends on common stock (10,364)           (10,364)                      
Balance at Apr. 28, 2012 $ 255,224 $ 19,188 $ 0 $ 77,652 $ 15,573 $ (11,377) $ 154,008 $ 180                    
Balance, shares at Apr. 28, 2012   38,375,678