Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents
Accounts receivable:
Joint owners, net	1,250	2,397
Oil and gas production sales	5,783	16,985
Other	4,499	263
Total accounts receivable	11,532	19,645
Derivative asset - short-term	34,020	83
Other current assets	1,280	1,193
Total current assets	46,832	20,921
Proved oil and gas properties, full cost method	1,166,720	1,162,094
Other property and equipment	39,304	39,295
Total	1,206,024	1,201,389
Less accumulated depreciation, depletion, amortization and impairment	(908,266)	(872,431)
Total property and equipment, net	297,758	328,958
Operating lease right-of-use assets	295	327
Derivative asset, long-term	36,788	4,170
Other assets	255	255
Total assets	381,928	354,631
Current liabilities:
Accounts payable	14,594	19,280
Joint interest oil and gas production payable	8,097	18,050
Accrued interest	119	133
Accrued insurance claim and other expenses	5,355	361
Operating lease liability - current	88	98
Derivative liability short-term	800	10,688
Current maturities of long-term debt	284	280
Other current liabilities	390	582
Total current liabilities	29,727	49,472
Long-term debt – less current maturities	199,081	192,718
Operating lease liabilities - long-term	181	203
Derivative liability long-term		999
Future site restoration	7,447	7,420
Total liabilities	236,436	250,812
Commitments and contingencies (Note 9)
Stockholders’ Equity:
Preferred stock, par value $0.01 per share – authorized 1,000,000 shares; -0- shares issued and outstanding
Common stock, par value $0.01 per share, authorized 400,000,000 shares; 168,069,305 and 168,361,061 issued and outstanding at March 31, 2020 and December 31, 2019, respectively	1,681	1,684
Additional paid-in capital	420,373	420,140
Accumulated deficit	(276,562)	(318,005)
Total stockholders’ equity	145,492	103,819
Total liabilities and stockholders’ equity	$ 381,928	$ 354,631