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Note 19 - Marketable Securities (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Statement Line Items [Line Items]      
Financial assets at end of period $ 162,420 $ 123,113  
Trading securities [member]      
Statement Line Items [Line Items]      
Financial assets at end of period 0 $ 55,866 $ 60,264
Trading securities [member] | Financial assets impaired [member]      
Statement Line Items [Line Items]      
Financial assets at end of period $ 0