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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 | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Products segment net sales: |  |  |  |
Products segment net sales | $ 7,381 | $ 7,672 | $ 12,714 | $ 12,974
Products segment gross profit (loss): |  |  |  |
Products segment gross profit (loss) | 2,022 | 1,704 | 3,223 | 2,489
Pool and Commercial Products [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 3,375 | 4,905 | 5,891 | 7,195
Products segment cost of sales: |  |  |  |
Products segment cost of sales | 2,112 | 3,554 | 3,822 | 5,185
Products segment gross profit (loss): |  |  |  |
Products segment gross profit (loss) | 1,263 | 1,351 | 2,069 | 2,010
Government Products/ Research and Development Services [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 2,023 | 662 | 3,033 | 2,034
Products segment cost of sales: |  |  |  |
Products segment cost of sales | 1,472 | 736 | 2,371 | 2,060
Products segment gross profit (loss): |  |  |  |
Products segment gross profit (loss) | 551 | (74) | 662 | (26)
Products Segment [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 5,398 | 5,567 | 8,924 | 9,229
Products segment cost of sales: |  |  |  |
Products segment cost of sales | 3,584 | 4,290 | 6,193 | 7,245
Products segment gross profit (loss): |  |  |  |
Products segment gross profit (loss) | $ 1,814 | $ 1,277 | $ 2,731 | $ 1,984

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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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