Shareholders' Equity (Schedule of Common Stock Outstanding Roll Forward) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Class of Stock [Line Items]
Common stock, shares authorized	50,000,000
Common stock, no par value	$ 0
Common Stock [Member]
Class of Stock [Line Items]
Shares, Issued, Beginning Balance	13,423,000	13,632,000
Repurchase of common shares	(63,000)	(63,000)
Shares, Issued, Ending Balance	13,362,000	13,570,000
Shares, outstanding	13,362,000	13,570,000
Common Stock [Member] | Common Stock [Member]
Class of Stock [Line Items]
Issuance of common shares	2,000	1,000