Note 7 - Earnings Per Share - Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Basic weighted-average shares (in shares)	30,385,000	30,296,000	30,336,000	30,287,000
Conversion of unsecured loan notes (in shares)	0	0	0	0
Unexercised options and unvested RSUs (in shares)	242,000	75,000	0	0
Diluted weighted-average shares (in shares)	30,627,000	30,371,000	30,336,000	30,287,000