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Note 10 - Segments and Geographic Information (Details) - Additional Business Unit Gross Profitability Detail for Products Segment (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Products segment net sales: |  |  |  |
Products segment net sales | $ 5,988 | $ 7,904 | $ 18,702 | $ 20,878
Products segment gross profit: |  |  |  |
Products segment gross profit | 1,414 | 1,959 | 4,637 | 4,448
Pool and Commercial Products [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 2,612 | 4,159 | 8,503 | 11,354
Products segment cost of sales: |  |  |  |
Products segment cost of sales | 1,668 | 2,892 | 5,490 | 8,077
Products segment gross profit: |  |  |  |
Products segment gross profit | 944 | 1,267 | 3,013 | 3,277
Government Products/ Research and Development Services [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 1,272 | 1,679 | 4,305 | 3,713
Products segment cost of sales: |  |  |  |
Products segment cost of sales | 1,018 | 1,381 | 3,389 | 3,441
Products segment gross profit: |  |  |  |
Products segment gross profit | 254 | 298 | 916 | 272
Products Segment [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 3,884 | 5,838 | 12,808 | 15,067
Products segment cost of sales: |  |  |  |
Products segment cost of sales | 2,686 | 4,273 | 8,879 | 11,518
Products segment gross profit: |  |  |  |
Products segment gross profit | $ 1,198 | $ 1,565 | $ 3,929 | $ 3,549

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 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 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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