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Note 5 - Notes Payable and Long-term Debt (Details Textual) |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 18, 2015 USD ($) shares | Apr. 30, 2008 | Jul. 31, 2007 USD ($) a ft² | Sep. 30, 2015 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares | Jun. 23, 2014 USD ($) | Jul. 12, 2012 USD ($)
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 and Business Loan Agreement with BOKF [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 6,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Term | 2 years |  |  |  |  |  |  |  |
Promissory Note with BOKF [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 10,000,000 |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Shares to Be Purchased by Borrowing | shares | 1,200,000 |  |  |  |  |  |  |  |
Line of Credit Facility, Term of the Term Note into which the Principal Balance Will Be Rolled | 4 years |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  | $ 3,700,000 |  |  |  |  |
Treasury Stock, Shares, Acquired | shares |  |  |  | 529,000 |  |  |  |  |
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.85% |  |  |  |
Two Promissory Notes with BOKF [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 2.263% |  |  |  |
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Building [Member] |  |  |  |  |  |  |  |  |
Area of Real Estate Property | ft² |  |  | 191,000 |  |  |  |  |  |
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Land [Member] |  |  |  |  |  |  |  |  |
Area of Real Estate Property | a |  |  | 30 |  |  |  |  |  |
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Term Note [Member] | Interest Expense [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Prepayment Penalty |  |  |  | $ 200,000 |  |  |  |  |
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Term Note [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  | 10 years |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.10% |  |  |  |  |  |  |
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 5,500,000 |  |  |  |  |  |
Proceeds from Bank Debt |  |  | $ 4,050,000 |  |  |  |  |  |
Line of Credit Note with JPMorgan Chase Bank, N.A.[Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 6,000,000 | $ 4,000,000
Proceeds from Issuance of Long-term Debt |  |  |  |  | $ 3,711,225 |  |  |  |
Treasury Stock, Shares, Acquired | shares |  |  |  |  | 529,000 | 0 | 0 |  |

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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 maximum number of shares of the Company's common stock for which the Company may borrow money to purchase under the terms of the debt agreement. + 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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