Interim Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Dividends declared to common stockholders, per share (in dollars per share)	$ 0.52	$ 0.52	$ 0.52	$ 0.52	$ 0.52	$ 0.52	$ 1.56	$ 1.56
Dividends declared to common stockholders, per share (in dollars per share)	$ 0.52	$ 0.52	$ 0.52	$ 0.52	$ 0.52	$ 0.52	$ 1.56	$ 1.56