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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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