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

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Namespace Prefix:	us-gaap_
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X

- 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

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Namespace Prefix:	us-gaap_
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