Consolidated Statements of Stockholder's Equity Statement - USD ($) $ in Thousands	Total	Accumulated deficit [Member]	Accumulated other comprehensive income [Member]	Treasury stock [Member]	Common Stock Class A [Member] Common stock [Member]	Common Stock Class B [Member] Common stock [Member]
Balance at Dec. 31, 2020	$ 300,945	$ (82,352)	$ 128,255	$ (11,011)	$ 262,869	$ 3,184
Net income (loss)	(3,573)	(3,573)	0	0	0	0
Unrealized investment gains (losses), net	(56,518)	0	(56,518)	0	0	0
Comprehensive income (loss)	(60,091)	(3,573)	(56,518)	0	0	0
Stock-based compensation	(14)	0	0	0	(14)	0
Balance at Mar. 31, 2021	240,840	(85,925)	71,737	(11,011)	262,855	3,184
Balance at Dec. 31, 2020	300,945	(82,352)	128,255	(11,011)	262,869	3,184
Net income (loss)	1,449
Unrealized investment gains (losses), net	(24,370)
Comprehensive income (loss)	(22,921)
Balance at Jun. 30, 2021	269,125	(80,903)	103,885	(20,101)	263,060	3,184
Balance at Mar. 31, 2021	240,840	(85,925)	71,737	(11,011)	262,855	3,184
Net income (loss)	5,022	5,022	0	0	0	0
Unrealized investment gains (losses), net	32,148	0	32,148	0	0	0
Comprehensive income (loss)	37,170	5,022	32,148	0	0	0
Acquisition of treasury stock	(9,090)	0	0	(9,090)	0	0
Stock-based compensation	205	0	0	0	205	0
Balance at Jun. 30, 2021	269,125	(80,903)	103,885	(20,101)	263,060	3,184
Balance at Dec. 31, 2021	320,571	(45,565)	117,492	(20,101)	265,561	3,184
Net income (loss)	(1,333)	(1,333)	0	0	0	0
Unrealized investment gains (losses), net	(124,217)	0	(124,217)	0	0	0
Comprehensive income (loss)	(125,550)	(1,333)	(124,217)	0	0	0
Common stock issuance	1,788	0	0	0	1,788	0
Stock-based compensation	93	0	0	0	93	0
Balance at Mar. 31, 2022	196,902	(46,898)	(6,725)	(20,101)	267,442	3,184
Balance at Dec. 31, 2021	320,571	(45,565)	117,492	(20,101)	265,561	3,184
Net income (loss)	(4,881)
Unrealized investment gains (losses), net	(240,440)
Comprehensive income (loss)	(245,321)
Balance at Jun. 30, 2022	76,239	(50,446)	(122,948)	(21,401)	267,850	3,184
Balance at Mar. 31, 2022	196,902	(46,898)	(6,725)	(20,101)	267,442	3,184
Net income (loss)	(3,548)	(3,548)	0	0	0	0
Unrealized investment gains (losses), net	(116,223)	0	(116,223)	0	0	0
Comprehensive income (loss)	(119,771)	(3,548)	(116,223)	0	0	0
Common stock issuance	455	0	0	0	455	0
Acquisition of treasury stock	(1,300)	0	0	(1,300)	0	0
Stock-based compensation	(47)	0	0	0	(47)	0
Balance at Jun. 30, 2022	$ 76,239	$ (50,446)	$ (122,948)	$ (21,401)	$ 267,850	$ 3,184