Note 3 - Other Current Assets (Details) - USD ($) $ in Thousands  | 
Mar. 31, 2016  | 
Dec. 31, 2015  | 
|---|---|---|
| Indemnification assets | $ 1,375 | $ 875 | 
| Letters of credit | 344 | 360 | 
| Other receivables | 960 | 1,048 | 
| Prepaid expenses | 243 | 180 | 
| Other | 102 | 106 | 
| $ 3,024 | $ 2,569 | 
| X | ||||||||||
- Definition Letters of credit that the company has extended to customers. No definition available. 
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| X | ||||||||||
- Definition Amount of assets classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
- Definition Amount of current assets classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
- Definition Amount due from parties in nontrade transactions, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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| X | ||||||||||
- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
| X | ||||||||||
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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