Equity Plan - Information Related to the Equity Plans for each of the Last Three Years (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Information Related to the Equity Plans
Cash received from option exercise	$ 1,220,000	$ 2,050,000	$ 1,469,000
Employee Stock Option [Member]
Information Related to the Equity Plans
Intrinsic value of options exercised	805,334	1,674,072	1,543,711
Cash received from option exercise	1,219,286	2,049,587	1,469,255
Tax benefit realized from option exercises	$ 20,527	$ 180,414	$ 153,745
Weighted average fair value of options granted (in dollars per share)	$ 1.34	$ 2.22	$ 2.31