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Note 6 - Loan Payable (Details) (USD $)
 9 Months Ended 12 Months Ended 9 Months Ended 1 Months Ended 13 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dutch Auction [Member]
Maximum [Member]
Sep. 30, 2013
Forward Contracts [Member]
Jan. 31, 2013
Dutch Auction Tender Offer [Member]
DLR Loan [Member]
Jan. 31, 2013
Dutch Auction Tender Offer [Member]
Jan. 31, 2013
Dutch Auction Tender Offer [Member]
Dec. 31, 2012
Base Rate [Member]
DLR Loan [Member]
Dec. 31, 2012
Base Rate [Member]
2012 DLRR Loan [Member]
Sep. 30, 2013
Base Rate [Member]
Operating Demand Loan [Member]
Dec. 31, 2012
London Interbank Offered Rate (LIBOR) [Member]
2012 DLRR Loan [Member]
Dec. 31, 2012
2012 Demand Loan Facilities [Member]
Sep. 30, 2013
DLR Loan [Member]
Jan. 31, 2013
DLR Loan [Member]
Dec. 31, 2012
DLR Loan [Member]
Dec. 31, 2012
2012 DLRR Loan [Member]
Sep. 30, 2013
2012 DLRR Loan [Member]
Sep. 30, 2013
Treasury Risk Management Facility [Member]
Sep. 30, 2013
Operating Demand Loan [Member]
Sep. 30, 2013
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                     $ 14,000,000           $ 3,500,000 $ 1,000,000    
Debt Instrument, Basis Spread on Variable Rate             1.25% 1.25% 1.25% 2.50%                    
Line of Credit Facility Share Repurchase Limit   10,000,000                                   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                       5,200,000 5,200,000 3,700,000   1,700,000        
Proceeds from Lines of Credit       5,200,000                                
Stock Repurchased During Period, Shares (in Shares)         4,114,121                              
Share Price (in Dollars per share)         $ 1.50 $ 1.50                            
Stock Repurchased and Retired During Period, Value (6,277,741)       6,171,656 6,171,656                            
Stock Repurchased And Retired During Period Transaction Cost         106,000                              
Derivative, Term of Contract     18 months                                  
Derivative, Notional Amount     32,800,000                                  
Debt Instrument, Fee Amount                                   500    
Maximum Total Funded Debt To EBITDA Ratio                                     2.00  
Line of Credit Facility, Covenant Terms,Minimum Fixed Charge Coverage                                     1.20  
Line of Credit Facility Maximum Annual Capital Expenditure Ceiling                                     $ 3,600,000