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Note 12 - Business Segment, Geographic and Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
For the year ended December 31, 2012 |  | Air Pollution Control Segment |  |  | FUEL CHEM Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 62,441 |  |  | $ | 35,203 |  |  | $ | - |  |  | $ | 97,644 |
Cost of sales |  |  | (40,146 | ) |  |  | (16,753 | ) |  |  | - |  |  |  | (56,899 | )
Gross margin |  |  | 22,295 |  |  |  | 18,450 |  |  |  | - |  |  |  | 40,745 |
Selling, general and administrative |  |  | - |  |  |  | - |  |  |  | (32,682 | ) |  |  | (32,682 | )
Research and development |  |  | - |  |  |  | - |  |  |  | (2,863 | ) |  |  | (2,863 | )
Operating income (loss) |  | $ | 22,295 |  |  | $ | 18,450 |  |  | $ | (35,545 | ) |  | $ | 5,200 |
For the year ended December 31, 2011 |  | Air Pollution Control Segment |  |  | FUEL CHEM Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 50,930 |  |  | $ | 42,738 |  |  | $ | - |  |  | $ | 93,668 |
Cost of sales |  |  | (28,467 | ) |  |  | (21,390 | ) |  |  | - |  |  |  | (49,857 | )
Gross margin |  |  | 22,463 |  |  |  | 21,348 |  |  |  | - |  |  |  | 43,811 |
Selling, general and administrative |  |  | - |  |  |  | - |  |  |  | (33,446 | ) |  |  | (33,446 | )
Gain from revaluation of ACT liability |  |  | - |  |  |  | - |  |  |  | 758 |  |  |  | 758 |
Research and development |  |  | - |  |  |  | - |  |  |  | (1,474 | ) |  |  | (1,474 | )
Operating income (loss) |  | $ | 22,463 |  |  | $ | 21,348 |  |  | $ | (34,162 | ) |  | $ | 9,649 |
For the year ended December 31, 2010 |  | Air Pollution Control Segment |  |  | FUEL CHEM Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 40,917 |  |  | $ | 40,878 |  |  | $ | - |  |  | $ | 81,795 |
Cost of sales |  |  | (27,024 | ) |  |  | (19,797 | ) |  |  | - |  |  |  | (46,821 | )
Gross margin |  |  | 13,893 |  |  |  | 21,081 |  |  |  | - |  |  |  | 34,974 |
Selling, general and administrative |  |  | - |  |  |  | - |  |  |  | (30,857 | ) |  |  | (30,857 | )
Gain from revaluation of ACT liability |  |  | - |  |  |  | - |  |  |  | 768 |  |  |  | 768 |
Research and development |  |  | - |  |  |  | - |  |  |  | (948 | ) |  |  | (948 | )
Operating income (loss) |  | $ | 13,893 |  |  | $ | 21,081 |  |  | $ | (31,037 | ) |  | $ | 3,937 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
For the years ended December 31, |  | 2012 |  |  | 2011 |  |  | 2010 |
Revenues: |  |  |  |  |  |  |  |  |
United States |  | $ | 70,425 |  |  | $ | 76,077 |  |  | $ | 69,002 |
Foreign |  |  | 27,219 |  |  |  | 17,591 |  |  |  | 12,793 |
|  | $ | 97,644 |  |  | $ | 93,668 |  |  | $ | 81,795 |
As of December 31, |  |  | 2012 |  |  |  | 2011 |
Assets: |  |  |  |  |  |  |  |
United States |  | $ | 86,466 |  |  | $ | 99,601 |
Foreign |  |  | 19,431 |  |  |  | 13,389 |
|  | $ | 105,897 |  |  | $ | 112,990 |
Schedule of Quarterly Financial Information [Table Text Block] |
For the quarters ended |  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
2012 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 25,212 |  |  | $ | 20,911 |  |  | $ | 24,907 |  |  | $ | 26,614 |
Cost of sales |  |  | 13,220 |  |  |  | 11,880 |  |  |  | 14,671 |  |  |  | 17,128 |
Net income (loss) |  |  | 1,543 |  |  |  | 68 |  |  |  | 1,194 |  |  |  | (29 | )
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.07 |  |  | $ | 0.00 |  |  | $ | 0.05 |  |  | $ | 0.00 |
Diluted |  | $ | 0.06 |  |  | $ | 0.00 |  |  | $ | 0.05 |  |  | $ | 0.00 |
2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 22,622 |  |  | $ | 19,021 |  |  | $ | 24,023 |  |  | $ | 28,002 |
Cost of sales |  |  | 11,466 |  |  |  | 10,553 |  |  |  | 13,050 |  |  |  | 14,788 |
Net income (loss) |  |  | 1,339 |  |  |  | 430 |  |  |  | 2,655 |  |  |  | 1,724 |
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.06 |  |  | $ | 0.02 |  |  | $ | 0.11 |  |  | $ | 0.07 |
Diluted |  | $ | 0.05 |  |  | $ | 0.02 |  |  | $ | 0.11 |  |  | $ | 0.07 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 + Details
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