Stockholders' Equity (Details Narrative)	12 Months Ended
	Apr. 30, 2017 $ / shares shares
Class A Common Stock [Member]
Purchases of common stock shares | shares	76,585
Series 1 Noncumulative Preferred Stock [Member]
Description of preferred stock conversion terms	Each share of the Series #1 preferred stock is convertible at the option of the holder into five shares of Class A common stock and is also redeemable at the option of the board of directors at $20 per share.
Redemption price per share | $ / shares	$ 20
Number of shares issued upon conversion | shares	5
Dividend rate per share | $ / shares	$ 1
Description of preferred stock dividend payment	The holders of the convertible preferred stock shall be entitled to a dividend at a rate up to $1 per share annually, payable quarterly as declared by the board of directors.