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Note 9 - Segments and Geographic Information (Details) - Additional Business Unit Gross Profitability Detail for Products Segment (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Products segment net sales: |  |
Products segment net sales | $ 4,919 | $ 4,458
Products segment gross profit: |  |
Products segment gross profit | 1,422 | 883
Pool and Commercial Products [Member] |  |
Products segment net sales: |  |
Products segment net sales | 1,166 | 1,641
Products segment cost of sales: |  |
Products segment cost of sales | 771 | 1,153
Products segment gross profit: |  |
Products segment gross profit | 395 | 488
Government Products/ Research and Development Services [Member] |  |
Products segment net sales: |  |
Products segment net sales | 1,565 | 1,010
Products segment cost of sales: |  |
Products segment cost of sales | 1,161 | 899
Products segment gross profit: |  |
Products segment gross profit | 404 | 111
Products Segment [Member] |  |
Products segment net sales: |  |
Products segment net sales | 2,731 | 2,651
Products segment cost of sales: |  |
Products segment cost of sales | 1,932 | 2,052
Products segment gross profit: |  |
Products segment gross profit | $ 799 | $ 599

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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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