Shareholders' Equity (Details) - USD ($)	1 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2018
Stock Repurchase Program [Abstract]
Stock repurchase program, additional amount authorized		$ 1,500,000
Stock repurchase program authorized amount							$ 20,000,000
Stock repurchased during period (in shares)					112,907
Amount paid to repurchase shares during the year					$ 3,313,154	$ 909,368
Amount of common stock repurchased	$ 18,086,249				$ 18,086,249
Number of common stock acquired (in shares)	1,282,265				1,282,265
Earnings Per Share [Abstract]
Basic weighted average shares outstanding (in shares)					3,233,773	3,285,813
Weighted average dilutive options outstanding (in shares)					0	0
Diluted weighted average shares outstanding (in shares)					3,233,773	3,285,813
Statutory Restrictions [Abstract]
Minimum statutory surplus required to maintain	$ 2,500,000				$ 2,500,000
Period from declaration of ordinary dividend requires notification to insurance commissioner					5 days
Minimum period prior to payment of dividend requires notification to insurance commissioner					10 days
Percentage of statutory capital and surplus	10.00%				10.00%
Ordinary dividends paid					$ 4,000,000	$ 6,000,000
Period for which no extraordinary dividends paid						2 years
Outside Directors [Member]
Share-based Compensation [Abstract]
Annual retainer fee paid to director					5,000
Per meeting fee paid to director					$ 2,500
Number of shares issued (in shares)	3,977		3,024
Stock issued during period (in dollars per share)	$ 27.00		$ 35.50		$ 27.00	$ 35.50
Cost of shares issued					$ 107,379	$ 107,352
Management and Employees [Member]
Share-based Compensation [Abstract]
Number of shares issued (in shares)					6,664	8,188
Cost of shares issued					$ 218,289	$ 246,535
Cumberland Lake Shell, Inc [Member]
Stock Repurchase Program [Abstract]
Stock repurchased during period (in shares)				88,341
Amount paid to repurchase shares during the year				$ 2,561,889
Stock purchase price (in dollars per share)				$ 29