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Note 5 - Summary of Credit Agreement and Line of Credit Note (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Promissory Note with BOKF [Member]    
Line of Credit Note dated September 18, 2015, in the maximum principal amount of $10,000,000 with features as more fully described above – interest due monthly at LIBOR plus 1.85%; matures September 18, 2020 $ 3,711,225
Promissory Note and Business Loan Agreement with BOKF [Member]    
Line of Credit Note dated September 18, 2015, in the maximum principal amount of $10,000,000 with features as more fully described above – interest due monthly at LIBOR plus 1.85%; matures September 18, 2020 $ 0
Credit Agreement with JPMorgan Chase Bank, N.A. [Member]    
Line of Credit Note dated September 18, 2015, in the maximum principal amount of $10,000,000 with features as more fully described above – interest due monthly at LIBOR plus 1.85%; matures September 18, 2020 $ 2,143,125
Line of Credit Note with JPMorgan Chase Bank, N.A.[Member]    
Line of Credit Note dated September 18, 2015, in the maximum principal amount of $10,000,000 with features as more fully described above – interest due monthly at LIBOR plus 1.85%; matures September 18, 2020 3,500,000
Line of Credit Note dated September 18, 2015, in the maximum principal amount of $10,000,000 with features as more fully described above – interest due monthly at LIBOR plus 1.85%; matures September 18, 2020 $ 3,711,225  
3,711,225 5,643,125
Current maturities of long-term debt 231,952 3,702,500
LONG-TERM DEBT, net of current maturities $ 3,479,273 $ 1,940,625