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Note 5 - Notes Payable and Long-term Debt - Summary of Credit Agreement and Line of Credit Note (Details) (Parentheticals) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Promissory Note with BOKF [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 15,000,000 | $ 15,000,000
Promissory Note with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.85% | 1.85%
Promissory Note and Business Loan Agreement with BOKF [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 6,000,000 | $ 6,000,000
Promissory Note and Business Loan Agreement with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.85% | 1.85%

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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 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 + Details
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