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Note 10 - Long-term Debt (Detail) - Long-term Debt (USD $)
0 Months Ended 12 Months Ended
Jun. 21, 2012
Jan. 12, 2012
Sep. 23, 2011
Apr. 20, 2011
Mar. 01, 2011
Dec. 31, 2012
Dec. 31, 2011
Balance           $ 345,352,312 $ 351,068,181
Additions 21,500,000 21,750,000 16,500,000 16,400,000 16,500,000 43,250,000  
Repayments           (48,965,869)  
Current portion of long-term debt           35,787,544 33,166,887
Current portion of long-term debt associated with vessel held for sale             791,823
Long term debt           309,564,768 317,109,471
Term Loan 1 [Member]
             
Original Amount           100,067,500  
Balance           40,421,883 46,831,735
Repayments           (6,409,852)  
Loan Agreement Date           May 30, 2016  
Term Loan 2 [Member]
             
Original Amount           79,850,000  
Balance           22,500,000 27,297,823
Repayments           (4,797,823)  
Loan Agreement Date           May 09, 2016  
Term Loan 3 [Member]
             
Original Amount           6,580,000  
Balance           2,710,960 3,184,720
Repayments           (473,760)  
Loan Agreement Date           Jun. 28, 2016  
Term Loan 4 [Member]
             
Original Amount           49,875,000  
Balance           30,845,014 34,600,514
Repayments           (3,755,500)  
Loan Agreement Date           Dec. 21, 2017  
Term Loan 5 [Member]
             
Original Amount           40,250,000  
Balance           26,875,000 29,375,000
Repayments           (2,500,000)  
Loan Agreement Date           Feb. 19, 2020  
Term Loan 6 [Member]
             
Original Amount           33,240,000  
Balance           25,484,000 27,423,000
Repayments           (1,939,000)  
Loan Agreement Date           Nov. 04, 2020  
Term Loan 7 [Member]
             
Original Amount           29,437,000  
Balance           10,210,000 24,285,502
Repayments           (14,075,502)  
Loan Agreement Date           Oct. 09, 2020  
Term Loan 8 [Member]
             
Original Amount           45,000,000  
Balance           37,350,000 40,750,000
Repayments           (3,400,000)  
Loan Agreement Date           Jul. 20, 2016  
Term Loan 9 [Member]
             
Original Amount           32,200,000  
Balance           23,616,259 26,130,423
Repayments           (2,514,164)  
Loan Agreement Date           Jul. 05, 2014  
Term Loan 10 [Member]
             
Original Amount           29,250,000  
Balance           22,080,000 23,850,000
Repayments           (1,770,000)  
Loan Agreement Date           Jul. 14, 2019  
Term Loan 11 [Member]
             
Original Amount           26,700,000  
Balance           17,434,196 19,589,464
Repayments           (2,155,268)  
Loan Agreement Date           Jul. 02, 2014  
Term Loan 12 [Member]
             
Original Amount           49,400,000  
Balance           44,450,000 47,750,000
Repayments           (3,300,000)  
Loan Agreement Date           Sep. 01, 2018  
Term Loan 13 [Member]
             
Original Amount           43,250,000  
Balance           41,375,000  
Additions           43,250,000  
Repayments           $ (1,875,000)  
Loan Agreement Date           Jun. 20, 2020