8. Business Segments and Revenues : Operating segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 459,786	$ 453,653	$ 1,674,021	$ 704,998
Cost of revenue	228,689	176,516	698,307	291,713
Gross profit	231,097	277,137	975,714	413,285
Depreciation and amortization	56,547	140,337	161,198	421,254
PrestoCorp
Revenue	416,982	453,653	1,602,599	704,998
Cost of revenue	158,360	176,516	607,837	291,713
Gross profit	258,622	277,137	994,762	413,285
Depreciation and amortization	13,858	20,128	42,030	60,626
GKMP
Revenue	42,568	0	70,989	0
Cost of revenue	70,329	0	90,470	0
Gross profit	(27,760)	0	(19,481)	0
Depreciation and amortization	13,377	0	13,377	0
Other
Revenue	236	0	433	0
Depreciation and amortization	$ 38,240	$ 120,209	$ 114,719	$ 360,628