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15. Intangible assets (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Intangible Assets Details Narrative Abstract |  |  |
Number of municipalities | 369 | 368 |
Program Contracts Commitments, Current | R$ 230,695 | R$ 128,802 |
Program Contracts Commitments, Noncurrent | 142,314 | 110,698 |
Capitalized interest and inflation adjustment | 488,502 | 649,048 | R$ 700,743
Construction margin | 63,013 | 70,335 | 81,513
Expropriations | 106,429 | 19,576 | R$ 40,452
Intangible assets - PPP | R$ 3,208,464 | 2,818,805 |
Intangible assets, physical evolution of contruction - PPP | 96.80% |  |
Intangible assets, discount rate for adjustment - PPP | 7.80% |  |
Intangible assets work in progress |  | 10,387,000 |
Intangible assets work in progress - São Paulo |  | 6,497,000 |
Intangible assets work in progress - PPP SÃO LOURENÇO |  | 2,819,000 |
Intangible assets work in progress - Franca |  | 253,000 |
Intangible assets work in progress, Itanhaém |  | R$ 208,000 |
Amortization average rate | 4.20% | 3.90% | 3.90%
Intangible assets related to PPP ALTO TIETÊ | R$ 359,759 | R$ 371,862 |
Estimated monetary restatement | 7,920,000 |  |
Monthly assigned funds from tariffs | R$ 10,361 |  |
Adjustment to present value of agreement | 8.20% |  |
Agreement percentage of revenue - São Paulo | 51.52% |  |
Construction margin | 2.30% | 2.30% |
Funds from tariffs arising from services provided - PPP São Lourenço | R$ 32,000 |  |

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