Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and equivalents	$ 10,269,842	$ 11,883,725
Investments	16,856,932	13,207,778
Production accounts receivable	1,388,922	1,189,524
Employees' notes receivable	7,800	33,500
Other	25,379	27,225
Total current assets	28,548,875	26,341,752
PROPERTY AND EQUIPMENT
Proved properties (successful efforts accounting method)	175,483,155	179,141,990
Pipeline and support equipment	682,135	682,135
Corporate and other	2,094,423	2,127,423
Gross property and equipment	178,259,713	181,951,548
Less accumulated depreciation, depletion, amortization and write down	169,103,259	172,431,241
Net property and equipment	9,156,454	9,520,307
OTHER ASSETS
Employees' notes receivable	1,111	13,242
Other	122,348	123,048
Total other assets	123,459	136,290
TOTAL ASSETS	37,828,788	35,998,349
CURRENT LIABILITIES
Accounts payable	1,894,683	1,958,042
Accrued expenses	731,405	1,624,205
Total current liabilities	2,626,088	3,582,247
DEFERRED INCOME TAXES	37,700	37,700
OPERATIONAL ADVANCES	1,839,768	1,513,924
ASSET RETIREMENT OBLIGATIONS	16,653,470	16,591,270
COMMITMENTS AND CONTINGENCIES
LIMITED PARTNERS' EQUITY, SUBJECT TO REPURCHASE RIGHT
Authorized - 8,000,000 Units, issued and outstanding - 5,549,355 and 5,587,616 Units, respectively	16,472,590	14,103,844
GENERAL PARTNER'S EQUITY	199,172	169,364
Total partners' equity	16,671,762	14,273,208
TOTAL LIABILITIES AND PARTNERS' EQUITY	$ 37,828,788	$ 35,998,349