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Note 18 - Valuation and Qualifying Accounts (Details) - Summary of Valuation and Qualifying Accounts (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Allowance for doubtful accounts, excluding provision for credit notes |  |  |
Balance at beginning year | $ 91,226 us-gaap_ValuationAllowancesAndReservesBalance | $ 73,970 us-gaap_ValuationAllowancesAndReservesBalance | $ 57,415 us-gaap_ValuationAllowancesAndReservesBalance
Charged to (recovered) costs and expenses | 34,540 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 17,256 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 16,555 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Balance at end of year | $ 125,766 us-gaap_ValuationAllowancesAndReservesBalance | $ 91,226 us-gaap_ValuationAllowancesAndReservesBalance | $ 73,970 us-gaap_ValuationAllowancesAndReservesBalance

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + 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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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + 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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