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28. Leases (Tables)
 12 Months Ended
Dec. 31, 2018
Leases Tables Abstract  
Future minimum payments
    12.31.18   12.31.17  
2017                                -                                -  
2018                                -                     124,503  
2019                     155,454                     124,626  
2020                     138,048                       52,194  
2021                     102,515                         4,597  
Total future minimum lease payments                     396,017                     305,920  
Expenses for operating assignments
    12.31.18   12.31.17   12.31.16
Total lease expenses   125,157   126,098   126,193
Future minimum collections
    12.31.18   12.31.17
2017                                -                                -
2018                                -                     202,143
2019                     173,619                     193,812
Total future minimum lease collections                     173,619                     395,955
Income from operating assignments
    12.31.18   12.31.17   12.31.16
Total lease income   190,370   212,265   199,431