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Note 7 - Loan Payable (Details Textual)
 3 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Two Thousand Twelve Demand Loan Facilities [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 2.50%  
Two Thousand Twelve Demand Loan Facilities [Member] | Maximum [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 14,000,000  
Line of Credit Facility Share Repurchase Limit 2,000,000  
Two Thousand Twelve Demand Loan Facilities [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 14,000,000  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.20%  
Debt Instrument, Term 4 years  
Proceeds from Lines of Credit $ 6,000,000  
Other Long-term Debt, Current $ 3,300,000 $ 0
DLR Loan [Member] | Base Rate [Member]    
Debt Instrument, Basis Spread on Variable Rate 1.25%  
DLR Loan [Member]    
Debt Instrument, Term 30 days  
Other Long-term Debt, Current $ 6,000,000 3,500,000
Amended Credit Facility [Member]    
Maximum Total Funded Debt to EBITDA Ratio 2  
Minimum Fixed Charge Coverage 1.2  
Line of Credit Facility, Maximum Annual Capital Expenditure Ceiling $ 5,000,000  
Base Rate [Member] | Operating Demand Loan [Member]    
Debt Instrument, Basis Spread on Variable Rate 1.25%  
Operating Demand Loan [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000,000  
Long-term Line of Credit 0  
Debt Instrument, Fee Amount 500  
Foreign Exchange Risk [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 3,500,000  
Derivative Asset, Fair Value, Gross Asset 17,000,000  
Other Long-term Debt, Current $ 9,281,250 $ 3,500,000
Line of Credit Facility Covenant Period 1 year 180 days