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Note 6 - Loan Payable (Details Textual)
 6 Months Ended
Jun. 30, 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  
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
DLRR Loan [Member] | Other Assets [Member]    
Renegotiation Fees Incurred 100,000  
DLRR Loan [Member]    
Other Long-term Debt, Current $ 3,100,000 0
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%  
Foreign Exchange Risk [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 3,500,000  
Derivative Asset, Fair Value, Gross Asset 11,000,000  
Operating Demand Loan [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 1,000,000  
Debt Instrument, Fee Amount 500  
Long-term Line of Credit 0  
Other Long-term Debt, Current $ 9,062,500 $ 3,500,000
Line of Credit Facility Covenant Period 1 year 180 days