Note 16 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2023	Mar. 31, 2022
Balance	$ 47,604	$ 50,393	$ 64,731	$ 65,958	$ 50,393	$ 65,958
Share-based compensation expense	513	420	737	558
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)					69,679	70,000
Issuance of common stock upon exercise of stock options, net	54	32	124	46
Issuance of common stock upon vesting of restricted stock units (in shares)					233,812	243,998
Stock buyback			(557)	(441)
Issuance of common stock upon vesting of restricted stock units	(2)		0
Release of obligation to issue commons stock		0		0
Release of obligation to issue commons stock		0		0
Accumulated other comprehensive loss		(266)	1	85
Accumulated other comprehensive loss		266	(1)	(85)
Net loss	(3,403)	(3,507)	(492)	(1,305)	$ (6,910)	$ (1,797)
Share-based compensation expense	513	420	737	558
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period					69,679	70,000
Issuance of common stock upon exercise of stock options, net	54	32	124	46
Shares retained for payment of taxes in connection with net share settlement of restricted stock units	(45)		(70)
Accumulated other comprehensive loss	81
Net loss	(3,403)	(3,507)	(492)	(1,305)	$ (6,910)	$ (1,797)
Balance	$ 44,802	$ 47,604	$ 64,472	$ 64,731	$ 44,802	$ 64,472
Common Stock [Member]
Balance (in shares)	36,713,471	36,611,240	36,371,529	36,403,833	36,611,240	36,403,833
Balance	$ 367	$ 366	$ 363	$ 364	$ 366	$ 364
Share-based compensation expense	$ 0	$ 0	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)	33,765	20,000	55,000	15,000
Issuance of common stock upon exercise of stock options, net	$ 1	$ 0	$ 1	$ 0
Issuance of common stock upon vesting of restricted stock units (in shares)	232,761	12,667	262,342
Stock buyback (in shares)			(142,442)	(116,868,000)
Stock buyback			$ (1)	$ (1)
Issuance of common stock upon vesting of restricted stock units	$ 2		2
Release of obligation to issue commons stock (in shares)		69,564		69,564
Release of obligation to issue commons stock (in shares)		69,564		69,564
Release of obligation to issue commons stock		$ 1		$ 0
Release of obligation to issue commons stock		1		0
Accumulated other comprehensive loss		0	0	0
Accumulated other comprehensive loss		0	0	0
Net loss	0	0	0	$ 0
Share-based compensation expense	$ 0	$ 0	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period	33,765	20,000	55,000	15,000
Issuance of common stock upon exercise of stock options, net	$ 1	$ 0	$ 1	$ 0
Issuance of common stock upon cashless exercise of stock options, net (in shares)	15,914
Shares retained for payment of taxes in connection with net share settlement of restricted stock units (in shares)	(11,616)		(18,344)
Shares retained for payment of taxes in connection with net share settlement of restricted stock units	$ 0		$ 0
Accumulated other comprehensive loss	0
Net loss	$ 0	$ 0	$ 0	$ 0
Balance (in shares)	36,984,295	36,713,471	36,528,085	36,371,529	36,984,295	36,528,085
Balance	$ 370	$ 367	$ 365	$ 363	$ 370	$ 365
Additional Paid-in Capital [Member]
Balance	109,003	108,551	107,273	107,110	108,551	107,110
Share-based compensation expense	513	420	737	558
Issuance of common stock upon exercise of stock options, net	54	32	124	46
Stock buyback			(557)	(441)
Issuance of common stock upon vesting of restricted stock units	(2)	0	0
Release of obligation to issue commons stock		0		0
Release of obligation to issue commons stock		0		0
Accumulated other comprehensive loss		0	0	0
Accumulated other comprehensive loss		0	0	0
Net loss	0	0	0	0
Share-based compensation expense	513	420	737	558
Issuance of common stock upon exercise of stock options, net	54	32	124	46
Shares retained for payment of taxes in connection with net share settlement of restricted stock units	(45)		(70)
Accumulated other comprehensive loss	0
Net loss	0	0	0	0
Balance	109,523	109,003	107,507	107,273	109,523	107,507
Retained Earnings [Member]
Balance	(60,873)	(57,366)	(42,459)	(41,154)	(57,366)	(41,154)
Share-based compensation expense	0	0	0	0
Issuance of common stock upon exercise of stock options, net	0	0	0	0
Stock buyback			0	0
Issuance of common stock upon vesting of restricted stock units	0		0
Release of obligation to issue commons stock		0		0
Release of obligation to issue commons stock		0		0
Accumulated other comprehensive loss		0	0	0
Accumulated other comprehensive loss		0	0	0
Net loss	(3,403)	(3,507)	(492)	(1,305)
Share-based compensation expense	0	0	0	0
Issuance of common stock upon exercise of stock options, net	0	0	0	0
Shares retained for payment of taxes in connection with net share settlement of restricted stock units	0		0
Accumulated other comprehensive loss	0
Net loss	(3,403)	(3,507)	(492)	(1,305)
Balance	(64,276)	(60,873)	(42,951)	(42,459)	(64,276)	(42,951)
AOCI Attributable to Parent [Member]
Balance	(526)	(792)	(83)	2	(792)	2
Share-based compensation expense	0	0	0	0
Issuance of common stock upon exercise of stock options, net	0	0	0	0
Stock buyback			0	0
Issuance of common stock upon vesting of restricted stock units	0	0	0
Release of obligation to issue commons stock				0
Release of obligation to issue commons stock				0
Accumulated other comprehensive loss		(266)	1	85
Accumulated other comprehensive loss		266	(1)	(85)
Net loss	0		0	0
Share-based compensation expense	0	0	0	0
Issuance of common stock upon exercise of stock options, net	0	0	0	0
Shares retained for payment of taxes in connection with net share settlement of restricted stock units	0		0
Accumulated other comprehensive loss	81
Net loss	0		0	0
Balance	$ (445)	$ (526)	$ (84)	$ (83)	$ (445)	$ (84)