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Note 5 - Notes Payable and Long-term Debt (Details Textual) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 18, 2015 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) | Aug. 25, 2016 USD ($) | Aug. 24, 2016 USD ($) | Jun. 07, 2016 shares | Aug. 31, 2015 shares
Proceeds from Issuance of Long-term Debt |  |  | $ 3,660,505 | $ 3,711,225 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | shares | 2,200,000 | 1,150,793 |  |  |  |  | 2,200,000 | 1,200,000
Treasury Stock, Shares, Acquired | shares |  | 0 |  |  |  |  |  |
Promissory Note and Business Loan Agreement with BOKF [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 6,000,000 |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | $ 0 | 0 |  |  |  |  |
Promissory Note and Business Loan Agreement with BOKF [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Covenants, Debt to EBITDA Ratio | 1.5 |  |  |  |  |  |  |
Promissory Note and Business Loan Agreement with BOKF [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Covenants, Fixed Charge Coverage Ratio | 1.2 |  |  |  |  |  |  |
Promissory Note with BOKF [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 10,000,000 |  |  |  | $ 15,000,000 | $ 10,000,000 |  |
Proceeds from Issuance of Long-term Debt |  | $ 0 | $ 3,700,000 |  |  |  |  |
Line of Credit Facility, Term of the Term Note into which the Principal Balance Will Be Rolled |  | 4 years |  |  |  |  |  |
Treasury Stock, Shares, Acquired | shares |  |  | 520,500 |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 7,600,000 |  |  |  |  |  |
Two Promissory Notes with BOKF [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.351% | 2.557% |  |  |  |  |
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.85% |  |  |  |  |  |

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- Definition Represents the debt-to-EBITDA ratio required under debt covenants. This ratio is calculated quarterly and is based on a trailing four quarter basis. + References No definition available. + Details
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- Definition Represents the Fixed Charged Coverage Ratio required under the debt covenants. This ratio is calculated quarterly and is based on a trailing four quarter basis. + References No definition available. + Details
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- Definition Represents the term of the term note into which the principal balance will be rolled. This is to happen on the earlier of a certain date specified in the debt agreement or the date on which the entire amount is drawn. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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