Note 8 - Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Details
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount			$ 4,244,578	$ 2,883,210
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount			(1,212,737)	(823,774)
Permanent difference			0	18,908
Income tax provision	$ 954,093	$ 849,716	$ 3,031,841	$ 2,078,344