Stockholders' Equity (Details) - USD ($) $ in Millions		12 Months Ended
	Mar. 19, 2024	Dec. 31, 2023	Dec. 31, 2022
Stockholders' Equity
Retained earnings from which dividends may not be paid without prior approval, total		$ 21.2	$ 20.7
Employee Stock Purchase Benefit Plans
Stockholders' Equity
Number of options issued or activity	0
Employee eligibility period		1 year
Employees to buy stock under options granted		85.00%
Options are vested when granted and will expire no later than		27 months
Common stock, capital shares reserved for future issuance		25,739
Dividend Reinvestment and Stock Purchase Plan
Stockholders' Equity
Employees to buy stock under options granted		95.00%
Shares of common stock purchased		17,581	11,166
Common stock, capital shares reserved for future issuance		185,950
Stockholder Purchase Plan
Stockholders' Equity
Number of options issued or activity		0
Options are vested when granted and will expire no later than		3 months
Common stock, capital shares reserved for future issuance		183,348