UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2020	$ 13	$ 4,430,924	$ (4,190,425)	$ 240,512
Shares, Outstanding, Beginning Balance at Dec. 31, 2020	12,792,586
Stock-based compensation		177		177
Issuance of common stock upon vesting of restricted stock
Stock Issued During Period, Shares, New Issues	3,021
Net income			3,389	3,389
Ending balance, value at Mar. 31, 2021	$ 13	4,431,101	(4,187,036)	244,078
Shares, Outstanding, Ending Balance at Mar. 31, 2021	12,795,607
Beginning balance, value at Dec. 31, 2020	$ 13	4,430,924	(4,190,425)	240,512
Shares, Outstanding, Beginning Balance at Dec. 31, 2020	12,792,586
Stock-based compensation				364
Ending balance, value at Jun. 30, 2021	$ 13	4,431,288	(4,173,066)	258,235
Shares, Outstanding, Ending Balance at Jun. 30, 2021	12,798,547
Beginning balance, value at Mar. 31, 2021	$ 13	4,431,101	(4,187,036)	244,078
Shares, Outstanding, Beginning Balance at Mar. 31, 2021	12,795,607
Stock-based compensation		187		187
Issuance of common stock upon vesting of restricted stock
Stock Issued During Period, Shares, New Issues	2,940
Net income			13,970	13,970
Ending balance, value at Jun. 30, 2021	$ 13	4,431,288	(4,173,066)	258,235
Shares, Outstanding, Ending Balance at Jun. 30, 2021	12,798,547
Beginning balance, value at Dec. 31, 2021	$ 13	4,431,719	(4,164,496)	267,236
Shares, Outstanding, Beginning Balance at Dec. 31, 2021	12,836,133
Stock-based compensation		85		85
Issuance of common stock upon vesting of restricted stock
Stock Issued During Period, Shares, New Issues	5,495
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	(6,815)
Net income			3,478	3,478
Ending balance, value at Mar. 31, 2022	$ 13	4,431,804	(4,161,018)	270,799
Shares, Outstanding, Ending Balance at Mar. 31, 2022	12,834,813
Beginning balance, value at Dec. 31, 2021	$ 13	4,431,719	(4,164,496)	267,236
Shares, Outstanding, Beginning Balance at Dec. 31, 2021	12,836,133
Stock-based compensation				251
Ending balance, value at Jun. 30, 2022	$ 13	4,431,970	(4,160,453)	271,530
Shares, Outstanding, Ending Balance at Jun. 30, 2022	12,839,118
Beginning balance, value at Mar. 31, 2022	$ 13	4,431,804	(4,161,018)	270,799
Shares, Outstanding, Beginning Balance at Mar. 31, 2022	12,834,813
Stock-based compensation		166		166
Issuance of common stock upon vesting of restricted stock
Stock Issued During Period, Shares, New Issues	4,305
Net income			565	565
Ending balance, value at Jun. 30, 2022	$ 13	$ 4,431,970	$ (4,160,453)	$ 271,530
Shares, Outstanding, Ending Balance at Jun. 30, 2022	12,839,118