Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Purchase of shares of treasury stock (in shares)	153,005	180,112	87,203
Shares of common stock for the exercise of stock options (in shares)	116,753	630,373	227,902
Issuance of restricted common shares, net of forfeitures (in shares)		6,793	6,005
Dividends declared per common share (in dollars per share)	$ 0.48	$ 0.21	$ 0.78