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Note 6 - Assets Available for Sale (Details Textual) - USD ($) | 1 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Nov. 30, 2015
Ames, Iowa Production Facility [Member] |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 1,192,000
Monona, Iowa Storage Facility [Member] | Subsequent Event [Member] |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | $ 8,046 |

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- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
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- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230 + Details
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