Note 14 - Stockholders' Equity - Summary of Combined Activity Under Equity Incentive Plans (Details) - $ / shares	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Outstanding, options (in shares)	0	38,800
Outstanding, weighted average exercise price (in dollars per share)	$ 0	$ 21.42
Forfeited, options (in shares)	0	(38,800)
Forfeited, weighted average exercise price (in dollars per share)	$ 0	$ 21.42
Outstanding, options (in shares)	0	0
Outstanding, weighted average exercise price (in dollars per share)	$ 0	$ 0
Restricted Stock [Member]
Outstanding, RSA (in shares)	1,000	42,097
Outstanding, weighted average grant date fair value per share (in dollars per share)	$ 14.59	$ 15.95
Forfeited, RSA (in shares)		0
Forfeited, weighted average grant date fair value per share (in dollars per share)		$ 0
Vested, RSA (in shares)	(1,000)	(41,097)
Vested, weighted average grant date fair value per share (in dollars per share)	$ 14.59	$ 14.67
Outstanding, RSA (in shares)	0	1,000
Outstanding, weighted average grant date fair value per share (in dollars per share)	$ 0	$ 14.59
Restricted Stock Units (RSUs) [Member]
Outstanding, RSA (in shares)	323,859	299,374
Outstanding, weighted average grant date fair value per share (in dollars per share)	$ 9.54	$ 10.97
Granted, RSU (in shares)	228,250	200,350
Granted, weighted average grant date fair value per unit (in dollars per share)	$ 4.7	$ 8.49
Forfeited, RSA (in shares)	(7,312)	(51,603)
Forfeited, weighted average grant date fair value per share (in dollars per share)	$ 8.44	$ 9.17
Vested, RSA (in shares)	(167,248)	(124,262)
Vested, weighted average grant date fair value per share (in dollars per share)	$ 9.94	$ 11.2
Outstanding, RSA (in shares)	377,549	323,859
Outstanding, weighted average grant date fair value per share (in dollars per share)	$ 6.46	$ 9.54