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6. Intangibles (Details)
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense, 2019 $ 1,267,294
Amortization expense, 2020 1,106,076
Amortization expense, 2021 1,016,466
Amortization expense, 2022 757,985
Amortization expense, 2023 454,755
Amortization expense, thereafter 1,755,599
Total future amortization expense $ 6,358,175