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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Products segment net sales: |  |  |  |
Products segment net sales | $ 6,699 | $ 5,653 | $ 11,618 | $ 10,111
Products segment gross profit: |  |  |  |
Products segment gross profit | 2,174 | 1,238 | 3,596 | 2,121
Pool and Commercial Products [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 1,929 | 1,647 | 3,095 | 3,288
Products segment cost of sales: |  |  |  |
Products segment cost of sales | 1,194 | 1,168 | 1,965 | 2,321
Products segment gross profit: |  |  |  |
Products segment gross profit | 735 | 479 | 1,130 | 967
Government Products [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 3,620 | 1,603 | 5,162 | 1,856
Products segment cost of sales: |  |  |  |
Products segment cost of sales | 2,387 | 1,060 | 3,525 | 1,301
Products segment gross profit: |  |  |  |
Products segment gross profit | 1,233 | 543 | 1,637 | 555
Research and Development Services [Member] | Products Segment [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 5,566 | 3,670 | 8,297 | 6,321
Products segment cost of sales: |  |  |  |
Products segment cost of sales | 3,577 | 2,640 | 5,509 | 4,692
Products segment gross profit: |  |  |  |
Products segment gross profit | 1,989 | 1,030 | 2,788 | 1,629
Research and Development Services [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 17 | 420 | 40 | 1,177
Products segment cost of sales: |  |  |  |
Products segment cost of sales | (4) | 412 | 19 | 1,070
Products segment gross profit: |  |  |  |
Products segment gross profit | 21 | 8 | 21 | 107
Products Segment [Member] |  |  |  |
Products segment net sales: |  |  |  |
Products segment net sales | 5,566 | 3,670 | 8,297 | 6,321
Products segment gross profit: |  |  |  |
Products segment gross profit | $ 1,989 | $ 1,030 | $ 2,788 | $ 1,629

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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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