Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2020	4,748,012
Balance at Dec. 31, 2020	$ 47,480	$ 23,631,618	$ 27,614,087	$ 51,293,185
Stock-based compensation	0	269,593	0	269,593
Dividend declared	$ 0	0	(1,706)	(1,706)
401(k) stock match (in shares)	14,620
401(k) stock match	$ 146	223,003	0	223,149
Issuance of deferred stock awards (in shares)	14,597
Issuance of deferred stock awards	$ 146	(26,094)	0	(25,948)
Shares issued under Employee Stock Purchase Plan (in shares)	5,290
Shares issued under Employee Stock Purchase Plan	$ 53	53,799	0	53,852
Net income	$ 0	0	2,420,577	2,420,577
Balance (in shares) at Jun. 30, 2021	4,786,173
Balance at Jun. 30, 2021	$ 47,861	24,200,481	30,032,958	54,281,300
Exercise of stock options	$ 36	48,562	0	48,598
Exercise of stock options (in shares)	3,654
Balance (in shares) at Mar. 31, 2021	4,764,942
Balance at Mar. 31, 2021	$ 47,649	23,847,636	28,165,086	52,060,371
Stock-based compensation	0	166,463	0	166,463
Dividend declared	$ 0	0	(1,212)	(1,212)
401(k) stock match (in shares)	8,045
401(k) stock match	$ 80	132,662	0	132,742
Issuance of deferred stock awards (in shares)	7,896
Issuance of deferred stock awards	$ 79	(79)	0	0
Shares issued under Employee Stock Purchase Plan (in shares)	5,290
Shares issued under Employee Stock Purchase Plan	$ 53	53,799	0	53,852
Net income	$ 0	0	1,869,084	1,869,084
Balance (in shares) at Jun. 30, 2021	4,786,173
Balance at Jun. 30, 2021	$ 47,861	24,200,481	30,032,958	54,281,300
Exercise of stock options	$ 0	0	0	0
Balance (in shares) at Dec. 31, 2021	4,812,085
Balance at Dec. 31, 2021	$ 48,121	24,894,571	39,410,534	64,353,226
Stock-based compensation	0	214,862	0	214,862
Dividend declared	$ 0	0	(1,019,287)	(1,019,287)
401(k) stock match (in shares)	13,753
401(k) stock match	$ 138	304,902	0	305,040
Issuance of deferred stock awards (in shares)	41,816
Issuance of deferred stock awards	$ 418	(213,026)	0	(212,608)
Shares issued under Employee Stock Purchase Plan (in shares)	4,939
Shares issued under Employee Stock Purchase Plan	$ 49	72,505	0	72,554
Net income	$ 0	0	3,528,982	3,528,982
Balance (in shares) at Jun. 30, 2022	4,872,593
Balance at Jun. 30, 2022	$ 48,726	25,273,814	41,920,229	67,242,769
Balance (in shares) at Mar. 31, 2022	4,839,297
Balance at Mar. 31, 2022	$ 48,393	24,944,077	40,508,575	65,501,045
Stock-based compensation	0	109,935	0	109,935
Dividend declared	$ 0	0	(343,415)	(343,415)
401(k) stock match (in shares)	6,142
401(k) stock match	$ 62	148,268	0	148,330
Issuance of deferred stock awards (in shares)	22,215
Issuance of deferred stock awards	$ 222	(971)	0	(749)
Shares issued under Employee Stock Purchase Plan (in shares)	4,939
Shares issued under Employee Stock Purchase Plan	$ 49	72,505	0	72,554
Net income	$ 0	0	1,755,069	1,755,069
Balance (in shares) at Jun. 30, 2022	4,872,593
Balance at Jun. 30, 2022	$ 48,726	$ 25,273,814	$ 41,920,229	$ 67,242,769