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Note 11 - Long-term Debt - Summary of Long-term Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Long-term Debt, Total | $ 386,975,841 | $ 400,229,914
Proceeds from Issuance of Debt | 43,000,000 |
Repayments | (56,254,073) |
Current portion of long-term debt | 42,580,323 | 55,238,573
Long-term debt | 344,395,518 | 344,991,341
Total debt | 386,975,841 | 400,229,914
Current portion of deferred finance charges | 613,716 | 644,858
Debt Issuance Costs, Noncurrent, Net, Total | 1,453,677 | 540,414
Total deferred finance charges | 2,067,393 | 2,344,325
Total debt, net of deferred finance charges | 384,908,448 | 397,885,589
Less: Current portion of long-term debt, net of current portion of deferred finance charges | 41,966,607 | 54,593,715
Long term debt, net of deferred finance charges | $ 342,941,841 | 343,291,874
Term Loan 1 [Member] |  |
Maturity Date | Dec. 21, 2017 |
Original Amount | $ 49,875,000 |
Long-term Debt, Total |  | 14,414,250
Proceeds from Issuance of Debt |  |
Repayments | $ (14,414,250) |
Term Loan 4 [Member] |  |
Maturity Date | Feb. 19, 2020 |
Original Amount | $ 40,250,000 |
Long-term Debt, Total | 14,375,000 | 16,875,000
Proceeds from Issuance of Debt |  |
Repayments | $ (2,500,000) |
Term Loan 2 [Member] |  |
Maturity Date | Nov. 04, 2020 |
Original Amount | $ 33,240,000 |
Long-term Debt, Total | 15,789,000 | 17,728,000
Proceeds from Issuance of Debt |  |
Repayments | $ (1,939,000) |
Term Loan 3 [Member] |  |
Maturity Date | Oct. 09, 2020 |
Original Amount | $ 29,437,000 |
Long-term Debt, Total | 6,310,000 | 7,090,000
Proceeds from Issuance of Debt |  |
Repayments | $ (780,000) |
Term Loan 5 [Member] |  |
Maturity Date | Sep. 15, 2021 |
Original Amount | $ 24,600,000 |
Long-term Debt, Total | 17,114,365 | 21,141,273
Proceeds from Issuance of Debt |  |
Repayments | $ (4,026,908) |
Term Loan 6 [Member] |  |
Maturity Date | Apr. 14, 2020 |
Original Amount | $ 20,400,000 |
Long-term Debt, Total | 13,100,000 | 14,900,000
Proceeds from Issuance of Debt |  |
Repayments | $ (1,800,000) |
Term Loan 10 [Member] |  |
Maturity Date | Sep. 01, 2018 |
Original Amount | $ 49,400,000 |
Long-term Debt, Total | 27,950,000 | 31,250,000
Proceeds from Issuance of Debt |  |
Repayments | $ (3,300,000) |
Term Loan 7 [Member] |  |
Maturity Date | Jun. 20, 2020 |
Original Amount | $ 43,250,000 |
Long-term Debt, Total | 26,375,000 | 29,375,000
Proceeds from Issuance of Debt |  |
Repayments | $ (3,000,000) |
Term Loan 8 [Member] |  |
Maturity Date | Sep. 30, 2020 |
Original Amount | $ 45,212,500 |
Long-term Debt, Total | 23,739,007 | 28,791,594
Proceeds from Issuance of Debt |  |
Repayments | $ (5,052,587) |
Term Loan 9 [Member] |  |
Maturity Date | Jul. 31, 2022 |
Original Amount | $ 50,225,000 |
Long-term Debt, Total | 39,235,000 | 42,840,000
Proceeds from Issuance of Debt |  |
Repayments | $ (3,605,000) |
Term Loan 11 [Member] |  |
Maturity Date | Apr. 16, 2020 |
Original Amount | $ 30,000,000 |
Long-term Debt, Total | 19,005,000 | 22,335,000
Proceeds from Issuance of Debt |  |
Repayments | $ (3,330,000) |
Term Loan 12 [Member] |  |
Maturity Date | Oct. 02, 2020 |
Original Amount | $ 13,000,000 |
Long-term Debt, Total | 10,360,000 | 11,240,000
Proceeds from Issuance of Debt |  |
Repayments | $ (880,000) |
Term Loan 13 [Member] |  |
Maturity Date | Jan. 08, 2023 |
Original Amount | $ 20,925,000 |
Long-term Debt, Total | 17,020,000 | 18,440,000
Proceeds from Issuance of Debt |  |
Repayments | $ (1,420,000) |
Term Loan 14 [Member] |  |
Maturity Date | Jun. 30, 2023 |
Original Amount | $ 67,200,000 |
Long-term Debt, Total | 55,515,000 | 59,475,000
Proceeds from Issuance of Debt |  |
Repayments | $ (3,960,000) |
Term Loan 15 [Member] |  |
Maturity Date | Dec. 14, 2022 |
Original Amount | $ 22,400,000 |
Long-term Debt, Total | 19,413,344 | 20,906,672
Proceeds from Issuance of Debt |  |
Repayments | $ (1,493,328) |
Term Loan 16 [Member] |  |
Maturity Date | Sep. 03, 2021 |
Original Amount | $ 22,750,000 |
Long-term Debt, Total | 19,093,750 | 20,718,750
Proceeds from Issuance of Debt |  |
Repayments | $ (1,625,000) |
Term Loan 17 [Member] |  |
Maturity Date | Jul. 07, 2023 |
Original Amount | $ 25,350,000 |
Long-term Debt, Total | 20,596,875 | 22,709,375
Proceeds from Issuance of Debt |  |
Repayments | $ (2,112,500) |
Term Loan 18 [Member] |  |
Maturity Date | Dec. 11, 2022 |
Original Amount | $ 22,275,000 |
Long-term Debt, Total | 10,500,000 |
Proceeds from Issuance of Debt | 10,500,000 |
Repayments |  |
Term Loan 19 [Member] |  |
Maturity Date | May 16, 2025 |
Original Amount | $ 65,650,000 |
Long-term Debt, Total | 31,484,500 |
Proceeds from Issuance of Debt | 32,500,000 |
Repayments | $ (1,015,500) |

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