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Note 2 - Notes Payable and Long-term Debt - Summary of Credit Agreement and Line of Credit Note (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Long-term debt $ 8,354,668 $ 7,371,730
Long-term debt 8,354,668 7,371,730
Less current maturities 1,740,556 614,311
LONG-TERM DEBT, net of current maturities 6,614,112 6,757,419
Promissory Note with BOKF [Member]    
Long-term debt 8,354,668 7,371,730
Long-term debt 8,354,668 7,371,730
Promissory Note and Business Loan Agreement with BOKF [Member]    
Long-term debt
Long-term debt