Consolidated Statement of Changes in Stockholders' Equity and Changes in Net Assets - USD ($) $ in Thousands		Total	Common Stock [Member]	Preferred Stock [Member]	Capital in Excess of Par [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Parent [Member]	Noncontrolling Interest [Member]	Accumulated Undistributed Net Investment Loss [Member]	Net Unrealized Appreciation on Investment Net of Tax [Member]
Balance at Dec. 31, 2017		$ 287,159	$ 273		$ 273,716	$ (24,919)			$ 287,159
Balance (Investment Company Accounting [Member]) at Dec. 31, 2017											$ (65,592)	$ 103,681
Balance, shares at Dec. 31, 2017			27,294,327			(2,951,243)
Net decrease in net assets resulting from operations		(14,874)							(14,874)
Net decrease in net assets resulting from operations | Investment Company Accounting [Member]											(38,299)	23,425
Stock based compensation expense		152	$ 1		151				152
Issuance of restricted stock, net, shares			95,726
Ending balance at Mar. 31, 2018		272,437	$ 274		273,867	$ (24,919)			272,437
Ending balance (Investment Company Accounting [Member]) at Mar. 31, 2018											(103,891)	127,106
Ending balance, shares at Mar. 31, 2018			27,390,053			(2,951,243)
Adoption of Bank Holding Company Accounting at Mar. 31, 2018		27,065					$ 23,215			$ 27,065
Adoption of Bank Holding Company Accounting (Investment Company Accounting [Member]) at Mar. 31, 2018											103,891	(127,106)
Balance at April 2, 2018 at Mar. 31, 2018		299,502	$ 274		273,867	$ (24,919)	23,215		272,437	27,065
Balance at Dec. 31, 2017		287,159	$ 273		273,716	$ (24,919)			287,159
Balance (Investment Company Accounting [Member]) at Dec. 31, 2017											(65,592)	103,681
Balance, shares at Dec. 31, 2017			27,294,327			(2,951,243)
Net income (loss)	[1]	(32,604)
Ending balance at Sep. 30, 2018		280,415	$ 274		274,163	$ (24,919)	3,871	$ (469)	252,920	27,495
Ending balance, shares at Sep. 30, 2018			27,391,295			(2,951,243)
Balance at Dec. 31, 2017		287,159	$ 273		273,716	$ (24,919)			287,159
Balance (Investment Company Accounting [Member]) at Dec. 31, 2017											(65,592)	103,681
Balance, shares at Dec. 31, 2017			27,294,327			(2,951,243)
Net change in unrealized gains (losses) on investments, net of tax		(82)
Ending balance at Dec. 31, 2018		$ 290,204	$ 274		274,292	$ (24,919)	13,043	(82)	262,608	27,596
Ending balance, shares at Dec. 31, 2018		24,434,357	27,385,600			(2,951,243)
Balance at Mar. 31, 2018		$ 272,437	$ 274		273,867	$ (24,919)			272,437
Balance (Investment Company Accounting [Member]) at Mar. 31, 2018											(103,891)	127,106
Balance, shares at Mar. 31, 2018			27,390,053			(2,951,243)
Net income (loss)		(13,884)					(14,647)		(14,647)	763
Distributions to non- controlling interest		(592)								(592)
Stock based compensation expense		145			145				145
Issuance of restricted stock, net, shares			13
Net change in unrealized gains (losses) on investments, net of tax		(255)						(255)	(255)
Ending balance at Jun. 30, 2018		284,916	$ 274		274,012	$ (24,919)	8,568	(255)	257,680	27,236
Ending balance, shares at Jun. 30, 2018			27,390,066			(2,951,243)
Balance at Mar. 31, 2018		272,437	$ 274		273,867	$ (24,919)			272,437
Balance (Investment Company Accounting [Member]) at Mar. 31, 2018											$ (103,891)	$ 127,106
Balance, shares at Mar. 31, 2018			27,390,053			(2,951,243)
Net income (loss)		(17,730)
Ending balance at Sep. 30, 2018		280,415	$ 274		274,163	$ (24,919)	3,871	(469)	252,920	27,495
Ending balance, shares at Sep. 30, 2018			27,391,295			(2,951,243)
Balance at Jun. 30, 2018		284,916	$ 274		274,012	$ (24,919)	8,568	(255)	257,680	27,236
Balance, shares at Jun. 30, 2018			27,390,066			(2,951,243)
Net income (loss)		(3,846)					(4,697)		(4,697)	851
Distributions to non- controlling interest		(592)								(592)
Stock based compensation expense		151			151				151
Issuance of restricted stock, net, shares			1,229
Net change in unrealized gains (losses) on investments, net of tax		(214)						(214)	(214)
Ending balance at Sep. 30, 2018		280,415	$ 274		274,163	$ (24,919)	3,871	(469)	252,920	27,495
Ending balance, shares at Sep. 30, 2018			27,391,295			(2,951,243)
Balance at Dec. 31, 2018		$ 290,204	$ 274		274,292	$ (24,919)	13,043	(82)	262,608	27,596
Balance, shares at Dec. 31, 2018		24,434,357	27,385,600			(2,951,243)
Net income (loss)		$ 1,395					1,228		1,228	167
Distributions to non- controlling interest		(592)								(592)
Stock based compensation expense		165	$ 1		164				165
Issuance of restricted stock, net		0	$ 0	$ 0	0	$ 0	0	0	0	0
Issuance of restricted stock, net, shares			163,098
Forfeiture of restricted stock, net		0	$ 0	0	0	0	0	0	0	0
Forfeiture of restricted stock, net, shares			(1,699)
Net change in unrealized gains (losses) on investments, net of tax		669						669	669
Ending balance at Mar. 31, 2019		291,841	$ 275		274,456	$ (24,919)	14,271	587	264,670	27,171
Ending balance, shares at Mar. 31, 2019			27,546,999			(2,951,243)
Balance at Dec. 31, 2018		$ 290,204	$ 274		274,292	$ (24,919)	13,043	(82)	262,608	27,596
Balance, shares at Dec. 31, 2018		24,434,357	27,385,600			(2,951,243)
Net income (loss)		$ 2,187
Net change in unrealized gains (losses) on investments, net of tax		1,322
Ending balance at Sep. 30, 2019		$ 292,790	$ 276		275,143	$ (24,919)	11,746	1,240	263,486	29,304
Ending balance, shares at Sep. 30, 2019		24,609,296	27,560,539			(2,951,243)
Balance at Mar. 31, 2019		$ 291,841	$ 275		274,456	$ (24,919)	14,271	587	264,670	27,171
Balance, shares at Mar. 31, 2019			27,546,999			(2,951,243)
Net income (loss)		(6,643)					(7,500)		(7,500)	857
Distributions to non- controlling interest		(592)								(592)
Stock based compensation expense		340			340				340
Issuance of restricted stock, net		0	$ 0	0	0	$ 0	0	0	0	0
Issuance of restricted stock, net, shares			4,751
Forfeiture of restricted stock, net		0	$ 0	0	0	0	0	0	0	0
Forfeiture of restricted stock, net, shares			(949)
Net change in unrealized gains (losses) on investments, net of tax		558						558	558
Ending balance at Jun. 30, 2019		285,504	$ 275		274,796	$ (24,919)	6,771	1,145	258,068	27,436
Ending balance, shares at Jun. 30, 2019			27,550,801			(2,951,243)
Net income (loss)		7,435					4,975		4,975	2,460
Distributions to non- controlling interest		(592)								(592)
Stock based compensation expense		348	$ 1		347				348
Issuance of restricted stock, net		0	$ 0	0	0	$ 0	0	0	0	0
Issuance of restricted stock, net, shares			10,417
Forfeiture of restricted stock, net		0	$ 0	$ 0	0	0	0	0	0	0
Forfeiture of restricted stock, net, shares			(679)
Net change in unrealized gains (losses) on investments, net of tax		95						95	95
Ending balance at Sep. 30, 2019		$ 292,790	$ 276		$ 275,143	$ (24,919)	$ 11,746	$ 1,240	$ 263,486	$ 29,304
Ending balance, shares at Sep. 30, 2019		24,609,296	27,560,539			(2,951,243)

[1] Results include the six months ended September 30, 2018 under Bank Holding Company Accounting and the three months ended March 31, 2018 under Investment Company Accounting.