Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current
Cash and cash equivalents	$ 3,140	$ 3,055
Accounts receivable	372	557
Inventory	271	415
Prepaid expenses	199	247
Other current assets	4	4
Total current assets	3,986	4,278
Loan fees, net	4	4
Right of use asset - operating leases	26	41
Oil and gas properties, net (full cost accounting method)	4,192	4,385
Other property and equipment, net	121	149
Accounts receivable - noncurrent		65
Total assets	8,329	8,922
Current liabilities
Accounts payable - trade	132	269
Accrued liabilities	282	164
Lease liabilities - operating leases - current	26	41
Lease liabilities - finance leases - current	56	61
Asset retirement obligation - current	75	75
Total current liabilities	571	610
Lease liabilities - finance leases - noncurrent	26	41
Asset retirement obligation - noncurrent	1,907	1,923
Total liabilities	2,504	2,574
Commitments and contingencies (Note 10)
Preferred stock, 25,000,000 shares authorized:
Series A Preferred stock, $0.0001 par value, 10,000 shares designated; 0 shares issued and outstanding
Common stock, $.001 par value, authorized 100,000,000 shares, 10,666,211 and 10,658,775 shares issued and outstanding	11	11
Additional paid-in capital	58,297	58,293
Accumulated deficit	(52,483)	(51,956)
Total stockholders' equity	5,825	6,348
Total liabilities and stockholders' equity	$ 8,329	$ 8,922

Operating Lease, Right-of-Use Asset, Amortization

No definition available.

Name:	tgc_OperatingLeaseRightOfUseAssetAmortization
Namespace Prefix:	tgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).