Note 20 - Stock Options - Summary of Options Activities (Details) - USD ($)	6 Months Ended		12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Employee Stock Option Plan 2017 [Member]
Outstanding, options (in shares)	216,375	236,375	236,375
Outstanding, weighted average exercise price (in dollars per share)	$ 4.89	$ 5.21	$ 5.21
Outstanding, weighted average remaining contractual term (Year)	3 years 6 months 3 days	2 years 5 months 26 days	2 years 11 months 1 day	2 years 7 months 9 days
Aggregate intrinsic value outstanding	$ 39	$ 96	$ 140	$ 87
Granted, options (in shares)	48,000	25,000
Granted, weighted average exercise price (in dollars per share)	$ 4.88	$ 5.18
Exercised, options (in shares)	(63,875)	(5,000)
Exercise of stock option (in shares)	63,875	5,000
Exercised, weighted average exercise price (in dollars per share)	$ 3.12	$ 3.75
Forfeited or expired, options (in shares)	(3,500)	(40,000)
Forfeited or expired, weighted average exercise price (in dollars per share)	$ 3.75
Outstanding, options (in shares)	197,000	216,375	216,375	236,375
Outstanding, options (in shares)	197,000	216,375	216,375	236,375
Outstanding, weighted average exercise price (in dollars per share)	$ 5.48	$ 5.16	$ 4.89	$ 5.21
Outstanding at September 30, 2023 (in dollars per share)	$ 5.48	$ 5.16	$ 4.89	$ 5.21
Exercisable, options (in shares)	88,250	134,500
Exercisable, weighted average exercise price (in dollars per share)	$ 5.59	$ 4.78
Exercisable, weighted average remaining contractual term (Year)	3 years 29 days	1 year 8 months 23 days
Exercisable, aggregate intrinsic value	$ 16	$ 75
Director Plan 2017 [Member]
Outstanding, options (in shares)	420,000	420,000	420,000
Outstanding, weighted average exercise price (in dollars per share)	$ 4.91	$ 5.1	$ 5.1
Outstanding, weighted average remaining contractual term (Year)	2 years 4 months 28 days	2 years 4 months 2 days	2 years 10 months 28 days	2 years 10 months 6 days
Aggregate intrinsic value outstanding	$ 352	$ 255	$ 309	$ 228
Granted, options (in shares)	0	0
Granted, weighted average exercise price (in dollars per share)	$ 0	$ 0
Exercised, options (in shares)	0	0		0
Exercise of stock option (in shares)	0	0		0
Exercised, weighted average exercise price (in dollars per share)	$ 0
Forfeited or expired, options (in shares)	0
Forfeited or expired, weighted average exercise price (in dollars per share)	$ 0
Outstanding, options (in shares)	420,000	420,000	420,000	420,000
Outstanding, options (in shares)	420,000	420,000	420,000	420,000
Outstanding, weighted average exercise price (in dollars per share)	$ 4.91	$ 5.1	$ 4.91	$ 5.1
Outstanding at September 30, 2023 (in dollars per share)	$ 4.91	$ 5.1	$ 4.91	$ 5.1
Exercisable, options (in shares)	420,000	420,000
Exercisable, weighted average exercise price (in dollars per share)	$ 4.91	$ 5.1
Exercisable, weighted average remaining contractual term (Year)	2 years 4 months 28 days	2 years 4 months 2 days
Exercisable, aggregate intrinsic value	$ 352	$ 255