| Schedule of Segment Reporting Information, by Segment [Table Text Block] |
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| | $ | 276,470 | | | $ | 295,949 | | |
| | | 334,756 | | | | 341,886 | | Inventory profit elimination (2) | | | (32,416 | ) | | | (31,858 | ) | |
| | $ | 578,810 | | | $ | 605,977 | | |
| Schedule of Segment Reporting Information, by Segment [Table Text Block] |
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| | $ | 126,413 | | | $ | 116,210 | | | $ | 246,868 | | | $ | 240,810 | | |
| | | 164,703 | | | | 153,207 | | | | 310,743 | | | | 298,250 | | Elimination of inter-company sales | | | (83,581 | ) | | | (72,350 | ) | | | (159,685 | ) | | | (151,287 | ) | |
| | $ | 207,535 | | | $ | 197,067 | | | $ | 397,926 | | | $ | 387,773 | | | | | | | | | | | | | | | | | | | | |
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| | $ | 19,690 | | | $ | 13,155 | | | $ | 40,277 | | | $ | 34,697 | | |
| | | 6,689 | | | | 2,953 | | | | 8,329 | | | | 4,715 | | Adjustment of inter-company profit (1) | | | 128 | | | | 1,552 | | | | (1,199 | ) | | | (1,282 | ) | |
| | $ | 26,507 | | | $ | 17,660 | | | $ | 47,407 | | | $ | 38,130 | | | | | | | | | | | | | | | | | | | | Depreciation & Amortization: | | | | | | | | | | | | | | | | | |
| | $ | 1,909 | | | $ | 1,995 | | | $ | 3,820 | | | $ | 4,089 | | |
| | | 2,897 | | | | 2,680 | | | | 5,769 | | | | 5,305 | | |
| | $ | 4,806 | | | $ | 4,675 | | | $ | 9,589 | | | $ | 9,394 | | | | | | | | | | | | | | | | | | | | |
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| | $ | 2,340 | | | $ | 3,048 | | | $ | 3,856 | | | $ | 7,009 | | |
| | | 1,896 | | | | 4,657 | | | | 3,518 | | | | 6,106 | | |
| | | - | | | | - | | | | - | | | | 1,991 | | |
| | $ | 4,236 | | | $ | 7,705 | | | $ | 7,374 | | | $ | 15,106 | | |