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Note 13 - Debt (Details Textual)
DKK in Millions
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Aug. 27, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
DKK
Aug. 28, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dansensor [Member]            
Long-term Line of Credit $ 0   $ 0     $ 0
Line of Credit Facility, Maximum Borrowing Capacity $ 1,500,000   $ 1,500,000 DKK 10    
Debt Instrument, Interest Rate, Stated Percentage 4.35%   4.35% 4.35%    
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.015% 0.0175%        
Revolving Credit Facility [Member]            
Long-term Line of Credit $ 2,800,000   $ 2,800,000     $ 3,300,000
Line of Credit Facility, Maximum Borrowing Capacity   $ 6,000,000     $ 10,000,000  
London Interbank Offered Rate LIBOR     0.24%      
Line of Credit Facility, Interest Rate at Period End 1.74%   1.74% 1.74%   2.00%
Debt Instrument Percentage of Common Stock Secured     65.00%