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Note 15 - Patents and Other Intangibles (Detail) - Future Amortization Expense on Intangible Assets (USD $)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
2013         $ 105,000
2014       123,000  
2015     97,000    
2016   80,000      
2017 49,000        
$ 454,000