CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME
Operating Revenues	$ 193	$ 29,499	$ 11,941	$ 68,478
Operating costs:
Operating expenses	3,330	19,732	14,272	48,748
General and administrative	2,746	4,261	5,553	7,935
Depreciation and amortization	3,400	4,383	6,834	9,287
Total cost and expenses	9,476	28,376	26,659	65,970
(Loss) income from operations	(9,283)	1,123	(14,718)	2,508
Other income (expense):
Interest income	56	115	126	220
Interest expense	(6)	(30)	(12)	(70)
Other income (expense), net	216	293	359	(165)
(Loss) income before income tax	(9,017)	1,501	(14,245)	2,493
Income tax expense		(1)
Net (loss) income	(9,017)	1,500	(14,245)	2,493
Other comprehensive income (loss):
Net unrealized income (loss) on foreign exchange rate translation, net	211	604	412	(595)
Comprehensive (loss) income	$ (8,806)	$ 2,104	$ (13,833)	$ 1,898
Basic (loss) income per share of common stock	$ (0.38)	$ 0.06	$ (0.61)	$ 0.11
Diluted (loss) income per share of common stock	$ (0.38)	$ 0.06	$ (0.61)	$ 0.11
Weighted average equivalent common shares outstanding	23,525,728	23,339,644	23,501,900	23,313,383
Weighted average equivalent common shares outstanding - assuming dilution	23,525,728	23,548,253	23,501,900	23,500,109