Note G - Stock Based Compensation - Restricted Stock Activity (Details) - Restricted Stock [Member]	6 Months Ended
	Sep. 30, 2021 $ / shares shares
Unvested (in shares) | shares	339,625
Unvested, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 6.07
Cancelled or forfeited (in shares) | shares	0
Cancelled or forfeited, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 0
Granted (in shares) | shares	6,000
Granted, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 13.00
Vested (in shares) | shares	(25,000)
Vested, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 4.41
Unvested (in shares) | shares	320,625
Unvested, weighted average grant date fair value per share (in dollars per share) | $ / shares	$ 6.33