Schedule II - Condensed Balance Sheets (Details) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 25,949	$ 18,694	$ 20,214	$ 27,928
Fixed maturity securities, available-for-sale, at fair value	104,638	88,957
Equity securities, at fair value	61,108	48,489
Short-term investments	13,134	32,787
Other investments	13,982	12,436
Accrued interest and dividends	1,033	946
Property, net	9,776	10,304
Total Assets	263,893	244,268	248,913
Accounts payable and accrued liabilities	28,318	27,735
Deferred income taxes, net	7,038	4,184
Total liabilities	72,531	68,629
Preferred stock (1,000 authorized shares; no shares issued)	0	0
Common stock – no par value (10,000 authorized shares; 1,889 and 1,887 shares issued and outstanding as of December 31, 2019 and 2018, respectively, excluding in each period 292 shares of common stock held by the Company)	0	0
Retained earnings	188,262	174,690
Accumulated other comprehensive income	3,100	949	15,945	11,761
Total Liabilities and Stockholders’ Equity	$ 263,893	$ 244,268
Preferred stock, shares authorized	1,000	1,000
Preferred stock, shares issued	0	0
Common stock, no par value
Common stock, shares authorized	10,000	10,000
Common stock, shares issued	1,889	1,887
Common stock, shares outstanding	1,889	1,887
Common stock, held by Company's subsidiary	292	292
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 9,651	$ 1,540	$ 5,872	$ 10,178
Fixed maturity securities, available-for-sale, at fair value	33,244	16,947
Equity securities, at fair value	4,141	3,360
Short-term investments	3,806	9,358
Investments in affiliated companies	133,053	134,551
Other investments	4,468	5,151
Prepaid expenses and other receivables	2,306	1,846
Current income taxes receivable	786	2,438
Accrued interest and dividends	321	186
Property, net	2,412	2,499
Total Assets	194,188	177,876
Accounts payable and accrued liabilities	2,471	2,190
Deferred income taxes, net	355	47
Total liabilities	2,826	2,237
Preferred stock (1,000 authorized shares; no shares issued)	0	0
Common stock – no par value (10,000 authorized shares; 1,889 and 1,887 shares issued and outstanding as of December 31, 2019 and 2018, respectively, excluding in each period 292 shares of common stock held by the Company)	0	0
Retained earnings	188,262	174,690
Accumulated other comprehensive income	3,100	949
Total stockholders’ equity	191,362	175,639
Total Liabilities and Stockholders’ Equity	$ 194,188	$ 177,876
Preferred stock, shares authorized	1,000	1,000
Preferred stock, shares issued	0	0
Common stock, no par value
Common stock, shares authorized	10,000	10,000
Common stock, shares issued	1,889	1,887
Common stock, shares outstanding	1,889	1,887
Common stock, held by Company's subsidiary	292	292