Note 2 - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule Of Useful Lives Of Property And Equipment [Table Text Block]

<div style="display: inline; font-family: times new roman; font-size: 10pt"><table cellpadding="0pt" cellspacing="0pt" style="margin: 0pt 25%; text-indent: 0px; font-family: "Times New Roman", Times, serif; font-size: 10pt; min-; min-width: 700px;"> <tr style="font-family: "Times New Roman", Times, serif; font-size: 10pt; background-color: rgb(204, 238, 255);"> <td style="vertical-align: top; width: 73%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin-bottom:0pt;margin-left:0pt;margin-right:1.8pt;margin-top:0pt;text-align:left;">Office furniture and fixtures (years)</div> </td> <td style="vertical-align: top; width: 10%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family: "Times New Roman", Times, serif; font-size: 10pt; margin: 0pt 1.8pt 0pt 0pt; text-align: right;">5</div> </td> <td style="vertical-align: top; width: 7%; font-family: "Times New Roman", Times, serif; font-size: 10pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">to</div></td> <td style="vertical-align: top; width: 10%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">10</div></td> </tr> <tr style="font-family: "Times New Roman", Times, serif; font-size: 10pt; background-color: rgb(255, 255, 255);"> <td style="vertical-align: top; width: 73%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin-bottom:0pt;margin-left:0pt;margin-right:1.8pt;margin-top:0pt;text-align:left;">Automotive equipment (years)</div> </td> <td style="vertical-align: top; width: 10%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family: "Times New Roman", Times, serif; font-size: 10pt; margin: 0pt 1.8pt 0pt 0pt; text-align: right;">5</div> </td> <td style="vertical-align: top; width: 7%; font-family: "Times New Roman", Times, serif; font-size: 10pt; text-align: center;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">to</div></td> <td style="vertical-align: top; width: 10%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">8</div></td> </tr> </table></div>

Schedule of Asset Retirement Obligations [Table Text Block]

	2018			2017
Beginning balance at January 1	$	1,774,634		$	1,710,677
Liabilities incurred		11,386			31,627
Liabilities settled (wells sold or plugged)		(64,129	)		(22,573	)
Accretion expense		47,139			46,574
Revision to estimate		5,084			8,329
Ending balance at December 31	$	1,774,114		$	1,774,634