Consolidated Statements of Shareholders' Equity (Deficit) (Unaudited) - USD ($)	Preferred Stock [Member] Series B Preferred Stock [Member]	Preferred Stock [Member] Series A Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]	Class B Preferred Units [Member]	Total
Balance (in shares) at Dec. 31, 2019	0		15,885,314
Balance at Dec. 31, 2019	$ 0	$ 40,000,000	$ 0	$ 212,692,000	$ (211,786,000)	$ (571,000)	$ 49,050,000	$ 335,000
Accretion of discount associated with issuance of subsidiary equity	0	0	0	(75,000)	0	0	75,000	(75,000)
Preferred dividends	$ 0	0	$ 0	(2,684,000)	0	0	0	(2,684,000)
Stock option exercises and proceeds related thereto (in shares)	0		2,000
Stock option exercises and proceeds related thereto	$ 0	0	$ 0	6,000	0	0	0	6,000
Compensatory stock issuances, net of forfeitures (in shares)	0		64,915
Compensatory stock issuances, net of forfeitures	$ 0	0	$ 0	0	0	0	0	0
Deferred stock-based compensation costs	$ 0	0	$ 0	368,000	0	0	0	368,000
Redemption and retirement of shares (in shares)	0		(74,724)
Redemption and retirement of shares	$ 0	0	$ 0	(559,000)	0	0	0	(559,000)
Net income	0	0	0	0	5,425,000	(63,000)	0	5,362,000
Contributions by owners of noncontrolling interests	0	0	0	0	0	0	50,000,000	0
Redemption and retirement of shares	$ 0	0	$ 0	(559,000)	0	0	0	(559,000)
Balance (in shares) at Mar. 31, 2020	0		15,877,505
Balance at Mar. 31, 2020	$ 0	40,000,000	$ 0	209,748,000	(206,361,000)	(634,000)	99,125,000	2,753,000
Balance (in shares) at Dec. 31, 2019	0		15,885,314
Balance at Dec. 31, 2019	$ 0	40,000,000	$ 0	212,692,000	(211,786,000)	(571,000)	49,050,000	$ 335,000
Redemption and retirement of shares (in shares)								(133,998)
Redemption and retirement of shares								$ (1,163,000)
Redemption and retirement of shares								(1,163,000)
Balance (in shares) at Sep. 30, 2020	0		15,967,856
Balance at Sep. 30, 2020	$ 0	40,000,000	$ 0	200,744,000	(144,341,000)	(730,000)	99,275,000	55,673,000
Balance (in shares) at Mar. 31, 2020	0		15,877,505
Balance at Mar. 31, 2020	$ 0	40,000,000	$ 0	209,748,000	(206,361,000)	(634,000)	99,125,000	2,753,000
Accretion of discount associated with issuance of subsidiary equity	0	0	0	(75,000)	0	0	75,000	(75,000)
Preferred dividends	$ 0	0	$ 0	(4,661,000)	0	0	0	(4,661,000)
Stock option exercises and proceeds related thereto (in shares)	0		37,667
Stock option exercises and proceeds related thereto	$ 0	0	$ 0	114,000	0	0	0	114,000
Deferred stock-based compensation costs	$ 0	0	$ 0	281,000	0	0	0	281,000
Redemption and retirement of shares (in shares)	0		(10,999)
Redemption and retirement of shares	$ 0	0	$ 0	(112,000)	0	0	0	(112,000)
Net income	0	0	0	0	23,165,000	(48,000)	0	23,117,000
Redemption and retirement of shares	$ 0	0	$ 0	(112,000)	0	0	0	(112,000)
Balance (in shares) at Jun. 30, 2020	0		15,904,173
Balance at Jun. 30, 2020	$ 0	40,000,000	$ 0	205,295,000	(183,196,000)	(682,000)	99,200,000	21,417,000
Accretion of discount associated with issuance of subsidiary equity	0	0	0	(75,000)	0	0	75,000	(75,000)
Preferred dividends	$ 0	0	$ 0	(4,713,000)	0	0	0	(4,713,000)
Stock option exercises and proceeds related thereto (in shares)	0		108,833
Stock option exercises and proceeds related thereto	$ 0	0	$ 0	426,000	0	0	0	426,000
Compensatory stock issuances, net of forfeitures (in shares)	0		3,125
Compensatory stock issuances, net of forfeitures	$ 0	0	$ 0	0	0	0	0	0
Deferred stock-based compensation costs	$ 0	0	$ 0	303,000	0	0	0	$ 303,000
Redemption and retirement of shares (in shares)	0		(48,275)					(48,275)
Redemption and retirement of shares	$ 0	0	$ 0	(492,000)	0	0	0	$ (492,000)
Net income	0	0	0	0	38,855,000	(48,000)	0	38,807,000
Redemption and retirement of shares	$ 0	0	$ 0	(492,000)	0	0	0	(492,000)
Balance (in shares) at Sep. 30, 2020	0		15,967,856
Balance at Sep. 30, 2020	$ 0	40,000,000	$ 0	200,744,000	(144,341,000)	(730,000)	99,275,000	55,673,000
Balance (in shares) at Dec. 31, 2020	0		16,115,353
Balance at Dec. 31, 2020	$ 0	40,000,000	$ 0	194,950,000	(117,666,000)	(774,000)	99,350,000	76,510,000
Accretion of discount associated with issuance of subsidiary equity	0	0	0	(75,000)	0	0	75,000	(75,000)
Preferred dividends	$ 0	0	$ 0	(4,612,000)	0	0	0	(4,612,000)
Stock option exercises and proceeds related thereto (in shares)	0		494,900
Stock option exercises and proceeds related thereto	$ 0	0	$ 0	1,696,000	0	0	0	1,696,000
Compensatory stock issuances, net of forfeitures (in shares)	0		39,942
Compensatory stock issuances, net of forfeitures	$ 0	0	$ 0	0	0	0	0	0
Deferred stock-based compensation costs	$ 0	0	$ 0	545,000	0	0	0	545,000
Redemption and retirement of shares (in shares)	0		(9,928)
Redemption and retirement of shares	$ 0	0	$ 0	(297,000)	0	0	0	(297,000)
Net income	0	0	0	0	44,075,000	(48,000)	0	44,027,000
Redemption and retirement of shares	$ 0	0	$ 0	(297,000)	0	0	0	(297,000)
Balance (in shares) at Mar. 31, 2021	0		16,640,267
Balance at Mar. 31, 2021	$ 0	40,000,000	$ 0	192,207,000	(73,591,000)	(822,000)	99,425,000	117,794,000
Balance (in shares) at Dec. 31, 2020	0		16,115,353
Balance at Dec. 31, 2020	$ 0	40,000,000	$ 0	194,950,000	(117,666,000)	(774,000)	99,350,000	$ 76,510,000
Stock option exercises and proceeds related thereto (in shares)								505,999
Redemption and retirement of shares (in shares)								(127,987)
Redemption and retirement of shares								$ (5,794,000)
Redemption and retirement of shares								(5,794,000)
Balance (in shares) at Sep. 30, 2021	3,188,533		16,553,615
Balance at Sep. 30, 2021	$ 0	40,000,000	$ 0	252,438,000	10,259,000	(745,000)	99,575,000	261,952,000
Balance (in shares) at Mar. 31, 2021	0		16,640,267
Balance at Mar. 31, 2021	$ 0	40,000,000	$ 0	192,207,000	(73,591,000)	(822,000)	99,425,000	117,794,000
Accretion of discount associated with issuance of subsidiary equity	0	0	0	(75,000)	0	0	75,000	(75,000)
Preferred dividends	$ 0	0	$ 0	(4,663,000)	0	0	0	(4,663,000)
Stock option exercises and proceeds related thereto (in shares)	0		833
Stock option exercises and proceeds related thereto	$ 0	0	$ 0	1,000	0	0	0	1,000
Compensatory stock issuances, net of forfeitures (in shares)	0		5,808
Compensatory stock issuances, net of forfeitures	$ 0	0	$ 0	0	0	0	0	0
Deferred stock-based compensation costs	$ 0	0	$ 0	687,000	0	0	0	687,000
Redemption and retirement of shares (in shares)	0		(8,747)
Redemption and retirement of shares	$ 0	0	$ 0	(304,000)	0	0	0	(304,000)
Net income	$ 0	0	$ 0	0	36,876,000	(50,000)	0	36,826,000
Issuance of series B preferred stock, net (in shares)	2,800,000		0
Issuance of series B preferred stock, net	$ 0	0	$ 0	66,148,000	0	0	0	66,148,000
Contributions by owners of noncontrolling interests	0	0	0	0	0	4,000	0	4,000
Redemption and retirement of shares	$ 0	0	$ 0	(304,000)	0	0	0	(304,000)
Balance (in shares) at Jun. 30, 2021	2,800,000		16,638,161
Balance at Jun. 30, 2021	$ 0	40,000,000	$ 0	254,001,000	(36,715,000)	(868,000)	99,500,000	216,418,000
Accretion of discount associated with issuance of subsidiary equity	0	0	0	(75,000)	0	0	75,000	(75,000)
Preferred dividends	$ 0	0	$ 0	(6,554,000)	0	0	0	(6,554,000)
Stock option exercises and proceeds related thereto (in shares)	0		10,266
Stock option exercises and proceeds related thereto	$ 0	0	$ 0	45,000	0	0	0	45,000
Compensatory stock issuances, net of forfeitures (in shares)	0		14,500
Compensatory stock issuances, net of forfeitures	$ 0	0	$ 0	0	0	0	0	0
Deferred stock-based compensation costs	$ 0	0	$ 0	1,092,000	0	0	0	$ 1,092,000
Redemption and retirement of shares (in shares)	0		(109,312)					(109,312)
Redemption and retirement of shares	$ 0	0	$ 0	(5,193,000)	0	0	0	$ (5,193,000)
Net income	$ 0	0	$ 0	0	46,974,000	123,000	0	47,097,000
Issuance of series B preferred stock, net (in shares)	388,533		0
Issuance of series B preferred stock, net	$ 0	0	$ 0	9,122,000	0	0	0	9,122,000
Redemption and retirement of shares	$ 0	0	$ 0	(5,193,000)	0	0	0	(5,193,000)
Balance (in shares) at Sep. 30, 2021	3,188,533		16,553,615
Balance at Sep. 30, 2021	$ 0	$ 40,000,000	$ 0	$ 252,438,000	$ 10,259,000	$ (745,000)	$ 99,575,000	$ 261,952,000