Note 16 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance	$ 33,812		$ 50,393
Share-based compensation expense	$ 446		420
Issuance of common stock upon exercise of stock options, net (in shares)	0	20,000
Issuance of common stock upon offering, net of issuance costs	$ 10,449
Issuance of common stock upon exercise of stock options, net			32
Issuance of common stock upon vesting of restricted stock units (in shares)	10,000	12,667
Issuance of common stock upon vesting of restricted stock units	$ 0		0
Stock Issued During Period, Value, Acquisitions	1,924
Release of obligation to issue common stock	0
Accumulated other comprehensive loss	119		266
Increase in Additional Paid-in Capital, Obligation to Issue Common Stock	527
Net loss	(6,724)	$ (3,507)
Balance	$ 40,553		$ 47,604
Common Stock [Member]
Balance (in shares)	37,211,071		36,611,240
Balance	$ 372		$ 366
Share-based compensation expense	$ 0
Issuance of common stock upon offering, net of issuance costs (in shares)	5,750,000
Issuance of common stock upon exercise of stock options, net (in shares)			20,000
Issuance of common stock upon offering, net of issuance costs	$ 57
Issuance of common stock upon exercise of stock options, net			$ 0
Issuance of common stock upon vesting of restricted stock units (in shares)	10,000		12,667
Issuance of common stock upon vesting of restricted stock units	$ 0		$ 0
Stock Issued During Period, Shares, Acquisitions	986,486
Release of obligation to issue common stock (in shares)	69,564		69,564
Stock Issued During Period, Value, Acquisitions	$ 10
Release of obligation to issue common stock	1		$ 1
Accumulated other comprehensive loss	0		0
Increase in Additional Paid-in Capital, Obligation to Issue Common Stock	0
Net loss	$ 0		$ 0
Balance (in shares)	44,027,121		36,713,471
Balance	$ 440		$ 367
Additional Paid-in Capital [Member]
Balance	110,379		108,551
Share-based compensation expense	446		420
Issuance of common stock upon offering, net of issuance costs	10,449
Issuance of common stock upon exercise of stock options, net			32
Issuance of common stock upon vesting of restricted stock units	0		0
Stock Issued During Period, Value, Acquisitions	1,924
Release of obligation to issue common stock	0		0
Accumulated other comprehensive loss	0		0
Increase in Additional Paid-in Capital, Obligation to Issue Common Stock	527
Net loss	0		0
Balance	123,725		109,003
Retained Earnings [Member]
Balance	(76,062)		(57,366)
Share-based compensation expense	0		0
Issuance of common stock upon offering, net of issuance costs	0
Issuance of common stock upon exercise of stock options, net			0
Issuance of common stock upon vesting of restricted stock units	0		0
Stock Issued During Period, Value, Acquisitions	0
Release of obligation to issue common stock	0		0
Accumulated other comprehensive loss	0		0
Increase in Additional Paid-in Capital, Obligation to Issue Common Stock	0
Net loss	(6,724)		(3,507)
Balance	(82,786)		(60,873)
AOCI Attributable to Parent [Member]
Balance	(505)		(792)
Share-based compensation expense	0		0
Issuance of common stock upon offering, net of issuance costs	0
Issuance of common stock upon exercise of stock options, net			0
Issuance of common stock upon vesting of restricted stock units	0		0
Stock Issued During Period, Value, Acquisitions	0
Release of obligation to issue common stock	0		0
Accumulated other comprehensive loss	119		266
Increase in Additional Paid-in Capital, Obligation to Issue Common Stock	0
Net loss	0		(3,507)
Balance	$ (386)		$ (526)