Schedule II - Condensed Balance Sheets (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 13,723	$ 25,949
Fixed maturity securities, available-for-sale, at fair value	117,713	104,638
Equity securities, at fair value	64,919	61,108
Short-term investments	15,170	13,134
Other investments	15,493	13,982
Accrued interest and dividends	1,038	1,033
Property, net	11,160	9,776
Total Assets	282,925	263,893
Accounts payable and accrued liabilities	36,020	28,318
Deferred income taxes, net	8,592	7,038
Total liabilities	82,503	72,531
Preferred stock (1,000 authorized shares; no shares issued)	0	0
Common stock – no par value (10,000 authorized shares; 1,892 and 1,889 shares issued and outstanding as of December 31, 2020 and 2019, respectively, excluding in each period 292 shares of common stock held by the Company)	0	0
Retained earnings	196,096	188,262
Accumulated other comprehensive income	4,326	3,100	$ 949
Total Liabilities and Shareholders’ Equity	$ 282,925	$ 263,893
Preferred stock, shares issued	0	0
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	10,000	10,000
Common stock, shares issued	1,892	1,889
Common stock, shares outstanding	1,892	1,889
Common stock, held by Company's subsidiary	292	292
Preferred stock, shares authorized	1,000	1,000
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 3,680	$ 9,651	$ 1,540
Fixed maturity securities, available-for-sale, at fair value	27,311	33,244
Equity securities, at fair value	4,554	4,141
Short-term investments	5,318	3,806
Investments in affiliated companies	150,620	133,053
Other investments	4,215	4,468
Prepaid expenses and other receivables	2,453	2,306
Current income taxes receivable	2,487	786
Accrued interest and dividends	207	321
Property, net	2,410	2,412
Total Assets	203,255	194,188
Accounts payable and accrued liabilities	2,313	2,471
Deferred income taxes, net	520	355
Total liabilities	2,833	2,826
Preferred stock (1,000 authorized shares; no shares issued)	0	0
Common stock – no par value (10,000 authorized shares; 1,892 and 1,889 shares issued and outstanding as of December 31, 2020 and 2019, respectively, excluding in each period 292 shares of common stock held by the Company)	0	0
Retained earnings	196,096	188,262
Accumulated other comprehensive income	4,326	3,100
Total shareholders’ equity	200,422	191,362
Total Liabilities and Shareholders’ Equity	$ 203,255	$ 194,188
Preferred stock, shares issued	0	0
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	10,000	10,000
Common stock, shares issued	1,892	1,889
Common stock, shares outstanding	1,892	1,889
Common stock, held by Company's subsidiary	292	292
Preferred stock, shares authorized	1,000	1,000