Statements Of Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Deferred Directors' Compensation [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Balances at Dec. 31, 2021	$ 88,340,552	$ 573,192	$ 36,741,266	$ 1,835,721	$ 54,798,980	$ (5,608,607)
Balances, shares at Dec. 31, 2021		34,405,287
Balances, Treasury shares at Dec. 31, 2021						(377,232)
Net income (loss)	(4,020,455)				(4,020,455)
Cost of equity issuance	(48,166)		(48,166)
At-the market offering	8,017	$ 45	7,972
At-the market offering, shares		2,710
Restricted stock award expense	433,137		433,137
Distribution of deferred directors' compensation		$ 1,024	462,735	(463,759)
Distribution of deferred directors' compensation, shares		61,452
Increase in deferred directors' compensation charged to expense	35,461			35,461
Balances at Mar. 31, 2022	84,748,546	$ 574,261	37,596,944	1,407,423	50,778,525	$ (5,608,607)
Balances, shares at Mar. 31, 2022		34,469,449
Balances, Treasury shares at Mar. 31, 2022						(377,232)
Balances at Dec. 31, 2021	88,340,552	$ 573,192	36,741,266	1,835,721	54,798,980	$ (5,608,607)
Balances, shares at Dec. 31, 2021		34,405,287
Balances, Treasury shares at Dec. 31, 2021						(377,232)
Net income (loss)	13,727,023
Balances at Sep. 30, 2022	107,778,519	$ 596,041	44,177,051	1,496,243	67,117,791	$ (5,608,607)
Balances, shares at Sep. 30, 2022		35,776,752
Balances, Treasury shares at Sep. 30, 2022						(377,232)
Balances at Mar. 31, 2022	84,748,546	$ 574,261	37,596,944	1,407,423	50,778,525	$ (5,608,607)
Balances, shares at Mar. 31, 2022		34,469,449
Balances, Treasury shares at Mar. 31, 2022						(377,232)
Net income (loss)	8,589,010				8,589,010
At-the market offering	4,742,769	$ 20,184	4,722,585
At-the market offering, shares		1,211,521
Restricted stock award expense	530,066		530,066
Dividends	(691,488)				(691,488)
Increase in deferred directors' compensation charged to expense	44,267			44,267
Balances at Jun. 30, 2022	97,963,170	$ 594,445	42,849,595	1,451,690	58,676,047	$ (5,608,607)
Balances, shares at Jun. 30, 2022		35,680,970
Balances, Treasury shares at Jun. 30, 2022						(377,232)
Net income (loss)	9,158,468				9,158,468
At-the market offering	336,426	$ 1,596	334,830
At-the market offering, shares		95,782
Restricted stock award expense	992,626		992,626
Dividends	(716,724)				(716,724)
Increase in deferred directors' compensation charged to expense	44,553			44,553
Balances at Sep. 30, 2022	107,778,519	$ 596,041	44,177,051	1,496,243	67,117,791	$ (5,608,607)
Balances, shares at Sep. 30, 2022		35,776,752
Balances, Treasury shares at Sep. 30, 2022						(377,232)
Balances at Dec. 31, 2022	$ 110,103,126	$ 598,731	43,344,916	1,541,070	68,925,774	$ (4,307,365)
Balances, shares at Dec. 31, 2022		35,938,206
Balances, Treasury shares at Dec. 31, 2022	300,272					(300,272)
Net income (loss)	$ 9,553,244				9,553,244
Restricted stock award expense	580,998		580,998
Dividends	(50,034)				(50,034)
Distribution of restricted stock to employees and directors			(766,846)			$ 766,846
Distribution of restricted stock to officers and directors, shares						53,476
Distribution of deferred directors' compensation			(24,330)	(281,497)		$ 305,827
Distribution of deferred directors' compensation, shares						21,312
Increase in deferred directors' compensation charged to expense	53,589			53,589
Balances at Mar. 31, 2023	120,240,923	$ 598,731	43,134,738	1,313,162	78,428,984	$ (3,234,692)
Balances, shares at Mar. 31, 2023		35,938,206
Balances, Treasury shares at Mar. 31, 2023						(225,484)
Balances at Dec. 31, 2022	$ 110,103,126	$ 598,731	43,344,916	1,541,070	68,925,774	$ (4,307,365)
Balances, shares at Dec. 31, 2022		35,938,206
Balances, Treasury shares at Dec. 31, 2022	300,272					(300,272)
Net income (loss)	$ 11,407,356
Balances at Sep. 30, 2023	$ 121,655,992	$ 598,742	44,249,366	1,425,155	78,618,090	$ (3,235,361)
Balances, shares at Sep. 30, 2023		35,938,900
Balances, Treasury shares at Sep. 30, 2023	225,723					(225,723)
Balances at Mar. 31, 2023	$ 120,240,923	$ 598,731	43,134,738	1,313,162	78,428,984	$ (3,234,692)
Balances, shares at Mar. 31, 2023		35,938,206
Balances, Treasury shares at Mar. 31, 2023						(225,484)
Net income (loss)	(41,291)				(41,291)
Purchase of treasury stock	(669)					$ 669
Purchase of treasury stock, shares						239
Restricted stock award expense	647,873		647,873
Dividends	(832,498)				(832,498)
Distribution of restricted stock to employees and directors		$ 11	(11)
Distribution of restricted stock to employees and directors, shares		694
Increase in deferred directors' compensation charged to expense	55,794			55,794
Balances at Jun. 30, 2023	120,070,132	$ 598,742	43,782,600	1,368,956	77,555,195	$ (3,235,361)
Balances, shares at Jun. 30, 2023		35,938,900
Balances, Treasury shares at Jun. 30, 2023						(225,723)
Net income (loss)	1,895,403				1,895,403
Restricted stock award expense	466,766		466,766
Dividends	(832,508)				832,508
Increase in deferred directors' compensation charged to expense	56,199			56,199
Balances at Sep. 30, 2023	$ 121,655,992	$ 598,742	$ 44,249,366	$ 1,425,155	$ 78,618,090	$ (3,235,361)
Balances, shares at Sep. 30, 2023		35,938,900
Balances, Treasury shares at Sep. 30, 2023	225,723					(225,723)