Note 7 - Earnings Per Share - Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Basic weighted-average shares (in shares)	30,264,000	24,668,000	28,895,000	24,633,000
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)	30,264,000	24,668,000	28,895,000	24,633,000