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Note 8 - Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Goodwill [Table Text Block] |
|  | Year Ended December 31, 2015 |  |  | Year Ended December 31, 2014 |
|  | Gross |  |  | Accumulated Impairment |  |  | Net |  |  | Gross |  |  | Accumulated Impairment |  |  | Net |
Balance at beginning of year |  | $ | 1,138,758 |  |  | $ | (503,193 | ) |  | $ | 635,565 |  |  | $ | 1,111,480 |  |  | $ | (503,193 | ) |  | $ | 608,287 |
Acquisitions of businesses, net |  |  | 38,765 |  |  |  | - |  |  | $ | 38,765 |  |  |  | 27,278 |  |  |  | - |  |  | $ | 27,278 |
Impairment |  |  | - |  |  |  | (4,611 | ) |  |  | (4,611 | ) |  |  | - |  |  |  | - |  |  |  | - |
Balance at end of year |  | $ | 1,177,523 |  |  | $ | (507,804 | ) |  | $ | 669,719 |  |  | $ | 1,138,758 |  |  | $ | (503,193 | ) |  | $ | 635,565 |
Schedule Of Intangible Assets [Table Text Block] |
|  | Weighted Average |  |  | December 31, 2015 |  |  | December 31, 2014 |
|  | Amortization Years |  |  | Cost |  |  | Accumulated Amortization |  |  | Amortized Cost |  |  | Cost |  |  | Accumulated Amortization |  |  | Amortized Cost |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tradenames |  |  | 7 |  |  | $ | 43,252 |  |  | $ | (10,516 | ) |  | $ | 32,736 |  |  | $ | 8,775 |  |  | $ | (8,775 | ) |  | $ | - |
Customer lists |  |  | 9 |  |  |  | 314,600 |  |  |  | (275,287 | ) |  |  | 39,313 |  |  |  | 304,180 |  |  |  | (263,178 | ) |  |  | 41,002 |
Patents |  |  | 14 |  |  |  | 126,491 |  |  |  | (72,719 | ) |  |  | 53,772 |  |  |  | 121,341 |  |  |  | (64,447 | ) |  |  | 56,894 |
Unpatented technology |  |  | 15 |  |  |  | 13,169 |  |  |  | (11,628 | ) |  |  | 1,541 |  |  |  | 13,169 |  |  |  | (10,435 | ) |  |  | 2,734 |
Software |  |  | 9 |  |  |  | 1,046 |  |  |  | (1,042 | ) |  |  | 4 |  |  |  | 1,046 |  |  |  | (1,037 | ) |  |  | 9 |
Non-compete/other |  |  | 9 |  |  |  | 1,731 |  |  |  | (508 | ) |  |  | 1,223 |  |  |  | 1,961 |  |  |  | (406 | ) |  |  | 1,555 |
Total finite-lived intangible assets |  |  |  |  |  | $ | 500,289 |  |  | $ | (371,700 | ) |  | $ | 128,589 |  |  | $ | 450,472 |  |  | $ | (348,278 | ) |  | $ | 102,194 |
Indefinite-lived tradenames |  |  |  |  |  |  | 128,321 |  |  |  | - |  |  |  | 128,321 |  |  |  | 182,684 |  |  |  | - |  |  |  | 182,684 |
Total intangible assets |  |  |  |  |  | $ | 628,610 |  |  | $ | (371,700 | ) |  | $ | 256,910 |  |  | $ | 633,156 |  |  | $ | (348,278 | ) |  | $ | 284,878 |

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