Note 12 - Stockholder's Equity - Stock Option Outstanding (Details) - $ / shares	6 Months Ended	9 Months Ended
	Dec. 31, 2022	Mar. 31, 2023
Balance, number of options (in shares)	0	0
Balance, options, weighted average exercise price (in dollars per share)	$ 0	$ 0
Granted, number of options (in shares)	50,000	220,000
Granted, options, weighted average exercise price (in dollars per share)	$ 1.45	$ 1.64
Exercised, number of options (in shares)		0
Exercised, options, weighted average exercise price (in dollars per share)		$ 0
Forfeited, number of options (in shares)		0
Forfeited, options, weighted average exercise price (in dollars per share)		$ 0
Balance, number of options (in shares)		270,000
Balance, options, weighted average exercise price (in dollars per share)		$ 1.61
Exercisable, number of options (in shares)		0
Exercisable, options, weighted average exercise price (in dollars per share)		$ 0