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Note 7 - Debt (Detail) - Future Maturities of Remaining Borrowings (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
2012 July through December             $ 25    
2013           803      
2014         59        
2015       65          
2016     72            
2017 and thereafter   96              
Gross long-term borrowings 1,120                
Less: discounts on long-term borrowings               (94) (172)
Total commitment, net               1,026 1,810
Less: portion classified as current               (474) (855)
Long-term borrowings, net               $ 552 $ 955