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Note 4 - Intangible Assets (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
PCB Permit [Member]        
Number of Definite-lived Permits     1  
Amortization of Intangible Assets $ 101,000 $ 108,000 $ 340,000 $ 360,000