Note 11 - Warrants - Outstanding and Exercisable (Details) - $ / shares	9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.2	$ 0.2
Class of Warrant or Right, Outstanding (in shares)	200,000	200,000
Outstanding, beginning of year, shares (in shares)	200,000	0
Outstanding, beginning of year, weighted average exercise price (in dollars per share)	$ 0.2	$ 0
Class of Warrant or Right, Exercisable (in shares)	200,000	200,000
Issued, shares (in shares)	0	200,000
Issued, weighted average exercise price (in dollars per share)	$ 0	$ 0.2
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	200,000
Outstanding, end of period, weighted average exercise price (in dollars per share)	$ 0.2	$ 0.2
Exercisable, end of period, weighted average exercise price (in dollars per share)	0.2	$ 0.2
Warrant One [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.2
Class of Warrant or Right, Outstanding (in shares)	200,000
Class of Warrant or Right, Outstanding, Weighted Average Remaining Contractual Life (Year)	9 months 10 days
Class of Warrant or Right, Exercisable (in shares)	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