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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
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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 |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Line of Credit Facility Share Repurchase Limit. + References No definition available. + Details
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- Definition The amount that the loan facility may not exceed a specified annual capital expenditures. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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