CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Balance at Dec. 31, 2018	$ 7	$ 208,317	$ (198,422)	$ (14)	$ 9,888
Balance (in shares) at Dec. 31, 2018	66,879,847
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for cash, net		2,848			2,848
Stock issued for cash, net (in shares)	560,338
Stock-based compensation		785			785
Stock issued for options and RSUs, net		816			816
Stock issued for options and RSUs, net (in shares)	663,816
Comprehensive income (loss):
Net income (loss)			(5,608)		(5,608)
Change in unrealized gain (loss), net				1	1
Comprehensive income (loss)					(5,607)
Balance at Mar. 31, 2019	$ 7	212,766	(204,030)	(13)	8,730
Balance (in shares) at Mar. 31, 2019	68,104,001
Balance at Dec. 31, 2018	$ 7	208,317	(198,422)	(14)	9,888
Balance (in shares) at Dec. 31, 2018	66,879,847
Comprehensive income (loss):
Net income (loss)					(14,694)
Change in unrealized gain (loss), net					2
Change in foreign currency, net					0
Comprehensive income (loss)					(14,692)
Balance at Sep. 30, 2019	$ 7	218,761	(213,116)	(12)	5,640
Balance (in shares) at Sep. 30, 2019	68,958,301
Balance at Mar. 31, 2019	$ 7	212,766	(204,030)	(13)	8,730
Balance (in shares) at Mar. 31, 2019	68,104,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for cash, net		2,849			2,849
Stock issued for cash, net (in shares)	467,928
Stock-based compensation		928			928
Stock issued for options and RSUs, net					0
Stock issued for options and RSUs, net (in shares)	182,618
Comprehensive income (loss):
Net income (loss)			(4,130)		(4,130)
Comprehensive income (loss)					(4,130)
Balance at Jun. 30, 2019	$ 7	216,543	(208,160)	(13)	8,377
Balance (in shares) at Jun. 30, 2019	68,754,547
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for cash, net		1,219			1,219
Stock issued for cash, net (in shares)	203,754
Stock-based compensation		999			999
Comprehensive income (loss):
Net income (loss)			(4,956)		(4,956)
Change in unrealized gain (loss), net				1	1
Change in foreign currency, net					0
Comprehensive income (loss)					(4,955)
Balance at Sep. 30, 2019	$ 7	218,761	(213,116)	(12)	5,640
Balance (in shares) at Sep. 30, 2019	68,958,301
Balance at Dec. 31, 2019	$ 7	223,237	(217,602)	(14)	5,628
Balance (in shares) at Dec. 31, 2019	69,586,764
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for cash, net		4,488			4,488
Stock issued for cash, net (in shares)	1,049,382
Stock-based compensation		778			778
Stock issued for options and RSUs, net		768			768
Stock issued for options and RSUs, net (in shares)	202,031
Comprehensive income (loss):
Net income (loss)			299,945		299,945
Change in unrealized gain (loss), net				2	2
Change in foreign currency, net				1	1
Comprehensive income (loss)					299,948
Balance at Mar. 31, 2020	$ 7	229,271	82,343	(11)	311,610
Balance (in shares) at Mar. 31, 2020	70,838,177
Balance at Dec. 31, 2019	$ 7	223,237	(217,602)	(14)	5,628
Balance (in shares) at Dec. 31, 2019	69,586,764
Comprehensive income (loss):
Net income (loss)					287,880
Change in unrealized gain (loss), net					1
Change in foreign currency, net					1
Comprehensive income (loss)					287,882
Balance at Sep. 30, 2020	$ 7	231,322	(563)	(12)	230,754
Balance (in shares) at Sep. 30, 2020	71,058,570
Balance at Mar. 31, 2020	$ 7	229,271	82,343	(11)	311,610
Balance (in shares) at Mar. 31, 2020	70,838,177
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		953			953
Warrant issued for services		104			104
Stock issued for options and RSUs, net		(78)			(78)
Stock issued for options and RSUs, net (in shares)	220,393
Dividends paid			(70,841)		(70,841)
Comprehensive income (loss):
Net income (loss)			(8,040)		(8,040)
Change in unrealized gain (loss), net				(1)	(1)
Comprehensive income (loss)					(8,041)
Balance at Jun. 30, 2020	$ 7	230,250	3,462	(12)	233,707
Balance (in shares) at Jun. 30, 2020	71,058,570
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation		1,072			1,072
Comprehensive income (loss):
Net income (loss)			(4,025)		(4,025)
Change in unrealized gain (loss), net					0
Change in foreign currency, net					0
Comprehensive income (loss)					(4,025)
Balance at Sep. 30, 2020	$ 7	$ 231,322	$ (563)	$ (12)	$ 230,754
Balance (in shares) at Sep. 30, 2020	71,058,570