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Note 1 - Organization and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Allowance for Credit Losses on Financing Receivables [Table Text Block] |
Year |  | Balance at January 1 |  | Provision charged to expense |  | Write-offs / Recoveries |  | Balance at December 31
2010 |  | $ | 70 |  |  | $ | 50 |  |  | $ | (38 | ) |  | $ | 82 |
2011 |  | $ | 82 |  |  | $ | 510 |  |  | $ | (162 | ) |  | $ | 430 |
2012 |  | $ | 430 |  |  | $ | 246 |  |  | $ | (216 | ) |  | $ | 460 |
Schedule of Comprehensive Income (Loss) [Table Text Block] |
|  | December 31, |
|  | 2012 |  |  | 2011 |
Foreign currency translation adjustments |  | $ | (384 | ) |  | $ | 346 |
Unrealized gain from marketable securities, net of tax |  |  | (8 | ) |  |  | 35 |
Accumulated Other Comprehensive Income, net of tax |  | $ | (392 | ) |  | $ | 381 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  |  |  |  | 2012 |  |  | 2011 |
Description of Other Intangible |  | Amortization Period (years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |
Customer lists |  |  | 3 | - | 15 |  |  | $ | 4,567 |  |  | $ | (2,186 | ) |  | $ | 2,381 |  |  | $ | 4,567 |  |  | $ | (1,779 | ) |  | $ | 2,788 |
Tradenames |  |  |  | 8 |  |  |  |  | 351 |  |  |  | (175 | ) |  |  | 176 |  |  |  | 351 |  |  |  | (132 | ) |  |  | 219 |
Patent assets |  |  | 12 | - | 18 |  |  |  | 2,083 |  |  |  | (667 | ) |  |  | 1,416 |  |  |  | 1,802 |  |  |  | (530 | ) |  |  | 1,272 |
Covenants not to compete |  |  | 5 | - | 6 |  |  |  | 376 |  |  |  | (313 | ) |  |  | 63 |  |  |  | 376 |  |  |  | (237 | ) |  |  | 139 |
Acquired technologies |  |  | 7 | - | 8 |  |  |  | 1,731 |  |  |  | (929 | ) |  |  | 802 |  |  |  | 1,731 |  |  |  | (707 | ) |  |  | 1,024 |
Total |  |  |  |  |  |  |  | $ | 9,108 |  |  | $ | (4,270 | ) |  | $ | 4,838 |  |  | $ | 8,827 |  |  | $ | (3,385 | ) |  | $ | 5,442 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Year |  | Estimated Amortization Expense |
2013 |  | $ | 801 |
2014 |  |  | 737 |
2015 |  |  | 704 |
2016 |  |  | 685 |
2017 |  |  | 374 |
Thereafter |  |  | 1,537 |
Total |  | $ | 4,838 |
Property, Plant and Equipment [Table Text Block] |
Description of Property and Equipment |  | Depreciable Life (years) |  |  | 2012 |  |  | 2011 |
Land |  |  |  |  | $ | 1,440 |  |  | $ | 1,440 |
Building |  |  |  | 39 |  |  |  |  | 4,535 |  |  |  | 4,535 |
Building and leasehold improvements |  |  | 3 | - | 39 |  |  |  | 4,480 |  |  |  | 4,448 |
Field equipment |  |  | 3 | - | 4 |  |  |  | 17,746 |  |  |  | 16,429 |
Computer equipment and software |  |  | 2 | - | 3 |  |  |  | 3,151 |  |  |  | 3,529 |
Furniture and fixtures |  |  | 3 | - | 10 |  |  |  | 1,782 |  |  |  | 1,451 |
Vehicles |  |  |  | 5 |  |  |  |  | 36 |  |  |  | 32 |
Total cost |  |  |  |  |  |  |  |  | 33,170 |  |  |  | 31,864 |
Less accumulated depreciation |  |  |  |  |  |  |  |  | (19,421 | ) |  |  | (18,239 | )
Total net book value |  |  |  |  |  |  |  | $ | 13,749 |  |  | $ | 13,625 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Basic weighted-average shares |  |  | 22,709,000 |  |  |  | 24,095,000 |  |  |  | 24,213,000 |
Conversion of unsecured loan notes |  |  | 7,000 |  |  |  | 7,000 |  |  |  | 7,000 |
Unexercised options |  |  | 63,000 |  |  |  | 188,000 |  |  |  | 185,000 |
Unvested restricted stock units |  |  | 756,000 |  |  |  | 343,000 |  |  |  | - |
Diluted weighted-average shares |  |  | 23,535,000 |  |  |  | 24,633,000 |  |  |  | 24,405,000 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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