Note 5 - Property and Equipment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Details
Total Depreciation Expense	$ 335,827	$ 341,015	$ 659,876	$ 719,614
Cost of revenues	249,791	218,142	502,030	494,263
General and administrative expenses	$ 86,036	$ 122,873	$ 157,846	$ 225,351