Consolidated Balance Sheets (Parentheticals) - $ / shares	Apr. 30, 2023	Apr. 30, 2022
Statement of Financial Position [Abstract]
Preferred stock, no par value (in usd per share)	$ 0	$ 0
Preferred stock, shares issued (in shares)	0	0
Common stock, no par value (in usd per share)	$ 0	$ 0
Common stock, shares issued (in shares)	37,263,248	37,111,667
Common stock, shares outstanding (in shares)	37,263,248	37,111,667