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Note 12 - Quarterly Financial Data (Details) - USD ($)
3 Months Ended 12 Months Ended 15 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Jun. 30, 2015
Revenue $ 31,590,790 $ 26,790,881 $ 21,944,320 $ 19,876,566 $ 20,067,439 $ 21,487,677 $ (23,751,623) $ 21,883,517 $ 100,202,557 $ 39,687,010 $ 82,988,522    
Gross Profit (loss) 3,554,831 5,596,432 3,848,369 3,602,071 4,276,019 4,471,304 (42,963,154) 4,491,132 16,601,703 (29,724,699) 18,433,247    
Net income (loss) $ 651,680 $ 2,446,085 $ 990,108 $ 928,120 $ 1,056,260 $ 1,697,547 $ (29,691,951) $ 1,728,869 $ 5,015,993 $ (25,209,275) $ 7,736,894    
Basic (in dollars per share) $ 0.08 $ 0.29 $ 0.12 $ 0.11 $ 0.20 $ 0.20 $ (3.50) $ 0.21 $ 0.59 $ (2.98) $ 0.92    
Diluted (in dollars per share) $ 0.08     $ 0.11 $ 0.20 $ 0.20 $ (3.50) $ 0.20 $ 0.58 $ (2.98) $ 0.91 $ 0.28 $ 0.12