Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Treasury Stock [Member]
Treasury stock reissued, shares (in shares)	2,770	2,770	2,770	2,770
Treasury stock purchased, shares (in shares)	0	0	150,920	5,352
Treasury stock reissued, shares (in shares)	2,770	2,770	2,770	2,770
Cash dividend declared, per share (in dollars per share)	$ 0.14	$ 0.11	$ 0.47	$ 0.38