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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