Note 5 - Stock-based Compensation - Non-vested Options (Details) - $ / shares	12 Months Ended
	Feb. 26, 2023	Feb. 27, 2022	Feb. 28, 2021
Non-vested, balance (in shares)	257,025
Non-vested, balance, weighted average grant date fair value (in dollars per share)	$ 2.75
Granted (in shares)	134,100	147,750	132,100
Granted, weighted average grant date fair value (in dollars per share)	$ 2.58
Vested (in shares)	(80,925)
Vested, weighted average grant date fair value (in dollars per share)	$ 2.85
Terminated or expired (in shares)	(16,387)
Terminated or expired, weighted average grant date fair value (in dollars per share)	$ 2.67
Non-vested, balance (in shares)	293,813	257,025
Non-vested, balance, weighted average grant date fair value (in dollars per share)	$ 2.65	$ 2.75