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Note 7 - Debt (Details Textual)
DKK in Millions
8 Months Ended 9 Months Ended 12 Months Ended
Aug. 28, 2015
USD ($)
Aug. 27, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2015
DKK
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.015% 0.0175% 0.015% 0.015%  
Revolving Credit Facility [Member]          
Debt Instrument, Maturity Date Aug. 26, 2018        
Long-term Line of Credit     $ 3,500,000 $ 3,300,000  
London Interbank Offered Rate LIBOR     0.20% 0.20%  
Line of Credit Facility, Maximum Borrowing Capacity $ 10,000,000 $ 6,000,000      
Line of Credit Facility, Interest Rate at Period End     1.70% 1.93% 1.70%
Debt Instrument Percentage of Common Stock Secured     65.00%    
Dansensor [Member]          
Long-term Line of Credit     $ 0 $ 0  
Line of Credit Facility, Maximum Borrowing Capacity     $ 1,500,000   DKK 10
Debt Instrument, Interest Rate, Stated Percentage     4.35%   4.35%