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Note 21 -SEGMENT FINANCIAL INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues from external customers $ 462,265 $ 471,946 $ 446,594
Revenues from Intersegment revenues 12,449 17,243 13,041
Total segment revenues 474,714 489,189 459,635
Elimination of intersegment revenues (12,449) (17,243) (13,041)
Total revenues 462,265 471,946 446,594
Segment profit (loss) 51,815 43,895 57,023
Inventory impairment (4,804) 1,993 (1,974)
Corporate and other expenses (33,382) (42,079) (28,371)
Exchange gain (loss) 2,226 (1,346) 3,041
Recovery of loss from flooding 4,762 0 0
Gain on liquidation of a subsidiary 279      
Interest income 1,555 1,409 492
Interest expense (2,197) (2,217) (1,364)
Other income 6,746 1,032 1,032
Income from continuing operations before income taxes 26,742 636 31,832
Segment assets 379,060 331,686 383,188
Corporate and other assets 5,910 1,168 493
Investment in equity investee companies 4,414 4,435 3,242
Total assets 389,384 337,289 386,923
Expenditures for additions to long-lived assets 10,187 8,888 3,653
Depreciation expenses 4,975 6,462 6,857
Depreciation expenses of continuing operations (4,975) (6,066) (6,488)
Depreciation expenses of discontinued operations    (396) (369)
Total depreciation expenses (4,975) (6,462) (6,857)
Impairment loss of long-lived assets and goodwill    (8,816)   
Interest income of continuing operations 1,555 1,409 492
Interest expense of continuing operations (2,195) (2,217) (1,364)
Share of net loss of equity investees (21) (58) (21)
Manufactured products [Member]
      
Revenues from external customers 401,023 429,474 396,059
Revenues from Intersegment revenues    3,283 3,143
Segment profit (loss) 44,665 42,876 53,429
Segment assets 362,092 326,960 374,634
Expenditures for additions to long-lived assets 10,172 8,775 3,650
Depreciation expenses (4,918) (6,014) (6,474)
Impairment loss of long-lived assets and goodwill    (8,816)   
Interest income of continuing operations 1,421 1,305 454
Interest expense of continuing operations (2,017) (2,050) (1,203)
Share of net loss of equity investees         
Distributed products [Member]
      
Revenues from external customers 54,797 25,500 26,935
Revenues from Intersegment revenues 12,449 13,960 9,898
Segment profit (loss) 3,361 2,955 1,378
Segment assets 16,711 4,369 8,195
Expenditures for additions to long-lived assets         
Depreciation expenses         
Impairment loss of long-lived assets and goodwill         
Interest income of continuing operations 65 81 27
Interest expense of continuing operations (120) (88) (73)
Share of net loss of equity investees         
Supply, delivery and installation of wires and cables
      
Revenues from external customers 6,445 16,972 23,600
Segment profit (loss) (1,015) 57 242
Segment assets 257 357 359
Expenditures for additions to long-lived assets         
Depreciation expenses         
Impairment loss of long-lived assets and goodwill         
Interest income of continuing operations 1 3 11
Interest expense of continuing operations (11) (39) (39)
Share of net loss of equity investees         
Corporate
      
Expenditures for additions to long-lived assets 15 113 3
Depreciation expenses (57) (52) (14)
Impairment loss of long-lived assets and goodwill         
Interest income of continuing operations 68 20   
Interest expense of continuing operations (47) (40) (49)
Share of net loss of equity investees $ (21) $ (58) $ (21)