Note 8 - Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Details
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount			$ 2,908,847	$ 1,679,952
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount			(831,099)	(479,986)
Permanent difference				28,662
Income tax provision	$ 768,539	$ 655,904	$ 2,077,748	$ 1,228,628