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Note 11 - Segments and Geographic Information (Details) - Additional Business Unit Gross Profitability Detail for Products Segment (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Products segment net sales:        
Products segment net sales $ 7,890 $ 4,827 $ 19,508 $ 14,938
Products segment gross profit:        
Products segment gross profit 2,558 930 6,154 3,051
Pool and Commercial Products [Member]
       
Products segment net sales:        
Products segment net sales 1,648 1,451 4,743 4,739
Products segment cost of sales:        
Products segment cost of sales 1,062 991 3,027 3,312
Products segment gross profit:        
Products segment gross profit 586 460 1,716 1,427
Government Products [Member]
       
Products segment net sales:        
Products segment net sales 6,002 707 11,164 2,563
Products segment cost of sales:        
Products segment cost of sales 3,945 445 7,470 1,746
Products segment gross profit:        
Products segment gross profit 2,057 262 3,694 817
Research and Development Services [Member] | Products Segment [Member]
       
Products segment net sales:        
Products segment net sales 7,666 2,723 15,963 9,044
Products segment cost of sales:        
Products segment cost of sales 5,023 2,009 10,532 6,701
Products segment gross profit:        
Products segment gross profit 2,643 714 5,431 2,343
Research and Development Services [Member]
       
Products segment net sales:        
Products segment net sales 16 565 56 1,742
Products segment cost of sales:        
Products segment cost of sales 16 573 35 1,643
Products segment gross profit:        
Products segment gross profit   (8) 21 99
Products Segment [Member]
       
Products segment net sales:        
Products segment net sales 7,666 2,723 15,963 9,044
Products segment gross profit:        
Products segment gross profit $ 2,643 $ 714 $ 5,431 $ 2,343