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Note 6 - Debt (Details Textual)
DKK in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
DKK
Dec. 31, 2016
USD ($)
Mar. 31, 2016
Dansensor [Member]        
Debt Instrument, Interest Rate, Stated Percentage 4.35% 4.35%    
Dansensor [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 700,000 DKK 5    
Long-term Line of Credit 0   $ 0  
Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 10,000,000      
London Interbank Offered Rate LIBOR 0.79%      
Line of Credit Facility, Interest Rate at Period End 2.29% 2.29%   1.94%
Debt Instrument Percentage of Common Stock Secured 65.00%      
Long-term Line of Credit $ 1,200,000   $ 0  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 0.015%