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Note 2 - Trade Accounts Receivable (Details) - Changes in Allowance for Doubtful Accounts (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Changes in Allowance for Doubtful Accounts [Abstract] |  |  |
Balance—beginning of year | $ 1,477 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 1,157 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 2,074 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Provision for bad debts | 456 us-gaap_ProvisionForDoubtfulAccounts | 424 us-gaap_ProvisionForDoubtfulAccounts | 191 us-gaap_ProvisionForDoubtfulAccounts
Charge-offs | (322)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | (104)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | (1,108)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Balance—end of year | $ 1,611 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 1,477 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 1,157 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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