<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><Version>2.2.0.25</Version><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><ReportLongName>039 - Disclosure - Note 11 - Concentrations of Credit Risk (Tables)</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>10/1/2009 - 9/30/2010
USD ($) / shares

USD ($)
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&lt;tr&gt;
&lt;td align="left" valign="top" width="26%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;North
America&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="top" width="12%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="top" width="2%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: #C0FFFF;"&gt;
&lt;td align="left" valign="top" width="26%" style="PADDING-LEFT: 0pt; MARGIN-LEFT: 9pt"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Nevada&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="right" valign="top" width="12%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;11&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="left" valign="top" width="2%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;%&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: white;"&gt;
&lt;td align="left" valign="top" width="26%" style="PADDING-LEFT: 0pt; MARGIN-LEFT: 9pt"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Alabama
(see Note 2)&lt;/font&gt;&lt;/div&gt;
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&lt;td align="right" valign="top" width="12%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;5&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="top" width="2%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: #C0FFFF;"&gt;
&lt;td align="left" valign="top" width="26%" style="PADDING-LEFT: 0pt; MARGIN-LEFT: 9pt"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Oklahoma&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="right" valign="top" width="12%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;5&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="top" width="2%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: white;"&gt;
&lt;td align="left" valign="top" width="26%" style="PADDING-LEFT: 0pt; MARGIN-LEFT: 9pt"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Other
(less than 5% individually)&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="right" valign="top" width="12%" style="BORDER-BOTTOM: black 2px solid"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline"&gt;29&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="top" width="2%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: #C0FFFF;"&gt;
&lt;td valign="top" width="26%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td align="right" valign="top" width="12%" style="BORDER-BOTTOM: black 4px double"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline"&gt;50&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="left" valign="top" width="2%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;%&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: white;"&gt;
&lt;td valign="top" width="26%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;International&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="right" valign="top" width="12%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td align="left" valign="top" width="2%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: #C0FFFF;"&gt;
&lt;td valign="top" width="26%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Argentina&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="right" valign="top" width="12%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;24&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="left" valign="top" width="2%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;%&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: white;"&gt;
&lt;td valign="top" width="26%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Europe&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="right" valign="top" width="12%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;12&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="left" valign="top" width="2%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: #C0FFFF;"&gt;
&lt;td valign="top" width="26%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Other
Latin America&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="right" valign="top" width="12%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;7&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="left" valign="top" width="2%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: white;"&gt;
&lt;td valign="top" width="26%" style="PADDING-BOTTOM: 2px"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 9pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;Other
(less than 5% individually)&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="right" valign="top" width="12%" style="BORDER-BOTTOM: black 2px solid"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline"&gt;7&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
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&lt;td align="left" valign="top" width="2%" style="PADDING-BOTTOM: 2px"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color: #C0FFFF;"&gt;
&lt;td valign="top" width="26%"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&amp;#160;&lt;/font&gt;&lt;/td&gt;
&lt;td align="right" valign="top" width="12%" style="BORDER-BOTTOM: black 4px double"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="right"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline"&gt;50&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td align="left" valign="top" width="2%"&gt;
&lt;div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;&lt;font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman"&gt;%&lt;/font&gt;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;</NonNumbericText><NonNumericTextHeader>North
America

&amp;#160;
&amp;#160;



Nevada


11


%




Alabama
(see Note 2)


5

&amp;#160;


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 -Publisher AICPA
 -Name Statement of Position (SOP)
 -Number 94-6
 -Paragraph 21, 22, 24

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