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Note 18 - Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract] |
Summary of Valuation Allowance [Table Text Block] |
|  | Balance at beginning year |  |  | Charged to (recovered) costs and expenses |  |  | Write-offs during year |  |  | Balance at end of year |
Allowance for doubtful accounts, excluding provision for credit notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 |  | $ | 91,226 |  |  | $ | 34,540 |  |  | $ | — |  |  | $ | 125,766 |
2013 |  | $ | 73,970 |  |  | $ | 17,256 |  |  | $ | — |  |  | $ | 91,226 |
2012 |  | $ | 57,415 |  |  | $ | 16,555 |  |  | $ | — |  |  | $ | 73,970 |

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Valuation Allowance -URI http://asc.fasb.org/extlink&oid=6528051 + Details
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