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Note 4 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Property, plant and equipment, gross $ 36,446 $ 24,806
Less accumulated depreciation (10,444) (8,178)
Property, plant and equipment, net 26,002 16,628
Land [Member]    
Property, plant and equipment, gross 1,614 1,614
Building [Member]    
Property, plant and equipment, gross 4,726 4,723
Machinery and Equipment [Member]    
Property, plant and equipment, gross 8,861 7,802
Computer Equipment [Member]    
Property, plant and equipment, gross 4,143 2,649
Construction in Progress [Member]    
Property, plant and equipment, gross 15,882 7,333
Property, Plant and Equipment, Other Types [Member]    
Property, plant and equipment, gross $ 1,220 $ 685