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Note 6 - Loan Payable (Details) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Foreign Exchange Risk [Member]
Mar. 31, 2014
Operating Demand Loan [Member]
Dec. 31, 2012
Base Rate [Member]
DLR Loan [Member]
Dec. 31, 2012
Base Rate [Member]
2012 DLRR Loan [Member]
Dec. 31, 2012
London Interbank Offered Rate (LIBOR) [Member]
2012 DLRR Loan [Member]
Dec. 31, 2012
2012 Demand Loan Facilities [Member]
Jan. 31, 2013
DLR Loan [Member]
Dec. 31, 2012
2012 DLRR Loan [Member]
Mar. 31, 2014
2012 DLRR Loan [Member]
Mar. 31, 2014
Amended Credit Facility [Member]
Dec. 31, 2012
Maximum [Member]
2012 Demand Loan Facilities [Member]
Note 6 - Loan Payable (Details) [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity $ 3,500,000 $ 1,000,000       $ 14,000,000         $ 14,000,000
Debt Instrument, Basis Spread on Variable Rate   1.25% 1.25% 1.25% 2.50%            
Line of Credit Facility Share Repurchase Limit                     2,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage           0.20%          
Debt Instrument, Term               4 years      
Line of Credit Facility, Amount Outstanding   0         5,200,000   5,700,000    
Line of Credit Facility, Covenant Period 18 months                    
Derivative Asset, Fair Value, Gross Asset 20,100,000                    
Debt Instrument, Fee Amount   500                  
Maximum Total Funded Debt To EBITDA Ratio                   2.00  
Minimum Fixed Charge Coverage                   1.20  
Line of Credit Facility Maximum Annual Capital Expenditure Ceiling                   $ 3,600,000