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Note 15 - Segments and Geographic Information (Details) - Additional Business Unit Gross Profitability Detail for Products Segment (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Products segment net sales: |  |  |
Products segment net sales | $ 21,533 | $ 23,375 | $ 20,453
Products segment gross profit: |  |  |
Products segment gross profit | 4,579 | 3,972 | 3,825
Pool and Commercial Products [Member] |  |  |
Products segment net sales: |  |  |
Products segment net sales | 5,966 | 8,486 | 6,612
Products segment cost of sales: |  |  |
Products segment cost of sales | 4,148 | 6,170 | 4,607
Products segment gross profit: |  |  |
Products segment gross profit | 1,818 | 2,316 | 2,005
Government Products/ Research and Development Services [Member] |  |  |
Products segment net sales: |  |  |
Products segment net sales | 5,720 | 4,320 | 4,278
Products segment cost of sales: |  |  |
Products segment cost of sales | 4,445 | 4,083 | 3,980
Products segment gross profit: |  |  |
Products segment gross profit | 1,275 | 237 | 298
Products Segment [Member] |  |  |
Products segment net sales: |  |  |
Products segment net sales | 11,686 | 12,806 | 10,890
Products segment cost of sales: |  |  |
Products segment cost of sales | 8,593 | 10,253 | 8,587
Products segment gross profit: |  |  |
Products segment gross profit | $ 3,093 | $ 2,553 | $ 2,303

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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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