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Note 12 - Financing Arrangements - Contractual Financing Obligations (Details) - USD ($)
Dec. 31, 2018
Mar. 31, 2018
December 31, 2019 $ 33,437,246  
December 31, 2020 8,730,834  
December 31, 2021 14,564,883  
December 31, 2022 1,567,200  
December 31, 2023 1,567,200  
Thereafter 7,288,000  
Long-term debt, gross 67,155,362 $ 48,450,238
Less: Unamortized Debt Issuance Costs (356,246) (365,288)
Long-term debt, total $ 66,799,116 $ 48,084,950