Note 7 - Earnings Per Share - Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Basic weighted-average shares (in shares)	30,296,000	30,264,000	30,282,000	28,895,000
Conversion of unsecured loan notes (in shares)	0	0	0	0
Unexercised options and unvested RSUs (in shares)	0	0	0	0
Diluted weighted-average shares (in shares)	30,296,000	30,264,000	30,282,000	28,895,000