Consolidated Statements of Stockholders' Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Shares issued from stock option exercises	5	0
Purchase of treasury shares (shares)	28,731	22,482
Issuance of common stock (shares)	0	0
Issuance of restricted stock (shares)	158,726	137,060