Note N - Share-based Compensation - Outstanding Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2024	Mar. 31, 2024
Options outstanding (in shares)	20,000
Options outstanding, weighted average exercise price (in dollars per share)	$ 73.25
Options outstanding, weighted average remaining contractual term (Year)	3 years 1 month 9 days	3 years 4 months 9 days
Options outstanding, aggregate intrinsic value	$ 0	$ 23
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	0
Granted, weighted average exercise price (in dollars per share)	$ 0
Exercised (in shares)	0
Exercised, weighted average exercise price (in dollars per share)	$ 0
Exercised, aggregate intrinsic value	$ 0
Options outstanding (in shares)	20,000	20,000
Options outstanding, weighted average exercise price (in dollars per share)	$ 73.25	$ 73.25
Options exercisable (in shares)	5,000
Options exercisable, weighted average exercise price (in dollars per share)	$ 68.5
Options exercisable, weighted average remaining contractual term (Year)	2 years 1 month 9 days
Options exercisable, aggregate intrinsic value	$ 0