Note 9. Commitment and contingencies (Details)	Mar. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 320,093
Operating Leases, Future Minimum Payments Due	1,496,838
Operating Leases, Future Minimum Payments, Due in Two and Three Years	484,428
Operating Leases, Future Minimum Payments, Due in Four and Five Years	547,788
Operating Leases, Future Minimum Payments, Due Thereafter	$ 144,529