Consolidated Statements of Changes in Stockholders Equity Consolidated Statements of Changes in Stockholders Equity (Parentheticals)	3 Months Ended		12 Months Ended
	Mar. 31, 2020 $ / shares	Mar. 31, 2019 $ / shares	Dec. 31, 2020 $ / shares	Dec. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares	Dec. 31, 2017 € / shares
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared | (per share)	$ 0.13	$ 0.52	$ 0.13	$ 0.52	$ 0.52	€ 0.52