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Note 12 - Geographical Information - Revenue by Geographic Areas (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenues $ 38,522,990 $ 44,653,929 $ 69,016,243 $ 67,012,449
UNITED STATES        
Revenues     64,393,507 63,831,135
Non-US [Member]        
Revenues     $ 4,622,736 $ 3,181,314