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Note 2 - Notes Payable and Long-term Debt - Summary of Credit Agreement and Line of Credit Note (Details) (Parentheticals) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Promissory Note with BOKF [Member]    
Line of Credit Note, Principal Amount $ 15,000,000 $ 15,000,000
Promissory Note and Business Loan Agreement with BOKF [Member]    
Line of Credit Note, Principal Amount $ 6,000,000 $ 6,000,000