Note 14 - Capital Stock - Dividends Paid (Details) - $ / shares		3 Months Ended
	Feb. 13, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Equity [Abstract]
Common Stock, Dividends, Per Share, Declared		$ 0.125	$ 0.125	$ 0.125	$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025
Common Stock, Dividends, Per Share, Announced	$ 0.125
Capital Stock [Line Items]
Common Stock, Dividends, Per Share, Declared		$ 0.125	$ 0.125	$ 0.125	$ 0.0025	$ 0.0025	$ 0.0025	$ 0.0025