Note 6 - Stock-based Compensation - Restricted Stock Activity (Details) - shares	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Restricted Stock [Member]
Non Vested, shares (in shares)		2,250
The 2013 Plan [Member]
Non Vested, shares (in shares)	250
Vested, shares (in shares)	0	(375)
Non Vested, shares (in shares)	250	1,875