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Note 8 - Debt (Details Textual)
DKK in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2016
DKK
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dansensor [Member]        
Long-term Line of Credit $ 0     $ 0
Line of Credit Facility, Maximum Borrowing Capacity   DKK 10 $ 1,500,000  
Debt Instrument, Interest Rate, Stated Percentage 4.35% 4.35%    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.50%      
Revolving Credit Facility [Member]        
Long-term Line of Credit $ 2,400,000     $ 2,800,000
Line of Credit Facility, Maximum Borrowing Capacity $ 10,000,000      
London Interbank Offered Rate LIBOR 0.47%      
Line of Credit Facility, Interest Rate at Period End 1.97% 1.97%   1.74%
Debt Instrument Percentage of Common Stock Secured 65.00%