Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

19. Finance Leases (Details - Future payments)

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19. Finance Leases (Details - Future payments) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]      
Minimum lease payments $ 25,712,988 $ 24,733,235 $ 28,401,966
Interest 7,396,201 7,756,629 10,027,255
Present value 18,279,603 16,976,606 18,374,711
Less Than One Year [Member]      
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]      
Minimum lease payments 2,180,616 1,920,618 3,514,879
Interest 1,049,434 998,984 1,658,525
Present value 1,131,182 921,634 1,856,354
Between 1 and 5 years [Member]      
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]      
Minimum lease payments 7,236,202 6,739,259 5,952,787
Interest 3,231,225 3,156,663 3,426,567
Present value 3,967,793 3,582,596 2,526,220
Later Than Five Years [Member]      
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]      
Minimum lease payments 16,296,170 16,073,358 18,934,300
Interest 3,115,542 3,600,982 4,942,163
Present value $ 13,180,628 $ 12,472,376 $ 13,992,137