Stock Options - Options (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Apr. 05, 2012
Stock option details
Number of rights issued			8,000
Base value of units issued (per unit)			$ 53.91
Employee Stock Option
Stock Options, Aggregate intrinsic value
Stock-based compensation expense	$ 47,000	$ 76,000	$ 169,000	$ 255,000
Employee Stock Option | 2012 Plan
Stock option details
Shares available for future grants					800,000
Maximum exercisable period for granted share-based compensation			10 years
Stock option activity
Options outstanding at the beginning of the period (in shares)			383,865
Less:
Options exercised (in shares)			(135,899)
Options forfeited (in shares)			(20,937)
Options outstanding at the end of the period (in shares)	227,029		227,029
Options fully vested and exercisable at the end of the period (in shares)	133,519		133,519
Stock Options, Weighted average exercise price
Options outstanding at the beginning, weighted average exercise price (in dollars per share)			$ 30.65
Less:
Options exercised, weighted average exercise price (in dollars per share)			24.26
Options forfeited, weighted average exercise price (in dollars per share)			23.27
Options outstanding at the end, weighted average exercise price (in dollars per share)	$ 35.15		35.15
Options fully vested and exercisable at the end, weighted average exercise price (in dollars per share)	$ 35.60		$ 35.60
Stock Options, Weighted average remaining contractual term (years)
Options outstanding at the end, weighted average remaining contractual term (years)			4 years 3 months 10 days
Options fully vested and exercisable at the end, weighted average remaining contractual term (years)			3 years 5 months 19 days
Stock Options, Aggregate intrinsic value
Options outstanding at the end, aggregate intrinsic value	$ 5,594,000		$ 5,594,000
Options fully vested and exercisable at the end, aggregate intrinsic value	3,230,000		3,230,000
Stock-based compensation cost, unrecognized	$ 263,000		$ 263,000
Stock-based compensation cost, unrecognized, weighted-average period of recognition			1 year 4 months 24 days
Incentive Stock Options to 10 Percent Shareholders | 2012 Plan
Stock option details
Maximum exercisable period for granted share-based compensation			5 years