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Note 18 - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | 18. Valuation and qualifying accounts:
|  | 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 The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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