Note 11 - Warrants - Outstanding and Exercisable (Details) - $ / shares	9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.2	$ 0
Outstanding, beginning of year, shares (in shares)	0	0
Class of Warrant or Right, Outstanding	200,000	0
Outstanding, beginning of year, weighted average exercise price (in dollars per share)	$ 0	$ 0
Class of Warrant or Right, Exercisable	200,000	0
Issued, shares (in shares)	200,000	0
Issued, weighted average exercise price (in dollars per share)	$ 0.2	$ 0
Exercised, shares (in shares)	0	0
Exercised, weighted average exercise price (in dollars per share)	$ 0	$ 0
Expired, shares (in shares)	0	0
Expired, weighted average exercise price (in dollars per share)	$ 0	$ 0
Cancelled, shares (in shares)	0	0
Cancelled, weighted average exercise price (in dollars per share)	$ 0	$ 0
Outstanding, end of period, shares (in shares)	200,000	0
Outstanding, end of period, weighted average exercise price (in dollars per share)	$ 0.2	$ 0
Exercisable, end of period, weighted average exercise price (in dollars per share)	0.2	$ 0
Warrant One [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.2
Class of Warrant or Right, Outstanding	200,000
Class of Warrant or Right, Outstanding, Weighted Average Remaining Contractual Life	1 year 3 months 10 days
Class of Warrant or Right, Exercisable	200,000
Outstanding, end of period, shares (in shares)	200,000
Outstanding, end of period, weighted average exercise price (in dollars per share)	$ 0.2