Note 8 - Income Taxes: Schedule of Provision for Income Tax Expense (Benefit) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Details
Current Federal Tax Expense (Benefit)			$ 2,763,366	$ 2,089,237
Deferred taxes			268,475	(10,893)
Income tax provision	$ 954,093	$ 849,716	$ 3,031,841	$ 2,078,344