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Note 5 - Notes Payable and Long-term Debt - Summary of Credit Agreement and Line of Credit Note (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Line of Credit Note $ 7,371,730 $ 7,371,730
7,371,730 7,371,730
Less current maturities 614,311 614,311
LONG-TERM DEBT, net of current maturities 6,757,419 6,757,419
Promissory Note with BOKF [Member]    
Line of Credit Note 7,371,730 7,371,730
7,371,730 7,371,730
Promissory Note and Business Loan Agreement with BOKF [Member]    
Line of Credit Note