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Note 12 - Segments and Geographic Information (Detail) - Additional Business Unit Gross Profitability Detail for Products-based Business Segment (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Products segment net sales: |  |  |  |  |  |
Products segment net sales | $ 29,837 |  | $ 25,752 |  | $ 35,129 |
Products segment gross profit: |  |  |  |  |  |
Products segment gross profit | 6,237 |  | 5,171 |  | 6,403 |
Products Segment [Member] |  |  |  |  |  |
Products segment net sales: |  |  |  |  |  |
Products segment net sales | 19,268 |  | 16,189 |  | 15,366 |
Products segment cost of sales: |  |  |  |  |  |
Products segment cost of sales | 14,450 |  | 12,540 |  | 12,394 |
Products segment gross profit: |  |  |  |  |  |
Products segment gross profit | 4,818 |  | 3,649 |  | 2,972 |
Pool and Commercial Products [Member] |  |  |  |  |  |
Products segment net sales: |  |  |  |  |  |
Products segment net sales | 14,948 |  | 11,911 |  | 12,265 |
Products segment cost of sales: |  |  |  |  |  |
Products segment cost of sales | 10,367 |  | 8,560 |  | 7,988 |
Products segment gross profit: |  |  |  |  |  |
Products segment gross profit | 4,581 |  | 3,351 |  | 4,277 |
Government Products/ Research and Development Services [Member] |  |  |  |  |  |
Products segment net sales: |  |  |  |  |  |
Products segment net sales | 4,320 |  | 4,278 |  | 3,101 |
Products segment cost of sales: |  |  |  |  |  |
Products segment cost of sales | 4,083 |  | 3,980 |  | 3,104 |
Products segment gross profit: |  |  |  |  |  |
Products segment gross profit | 237 |  | 298 |  | (3) |
Products Segment Overhead [Member] |  |  |  |  |  |
Products segment cost of sales: |  |  |  |  |  |
Products segment cost of sales |  | [1] |  | [1] | 1,302 | [1]
Products segment gross profit: |  |  |  |  |  |
Products segment gross profit |  | [1] |  | [1] | $ (1,302) | [1]
[1] | Unallocated manufacturing overhead is defined as costs associated with the operation and shut down of the Solon manufacturing facility which was relocated to the Mexico facility; and specific expenses which are not attributable to a specific business unit but rather are calculated on the total products business segment.

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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=6880815&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=6880815&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=6880815&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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