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Note 6 - Long-term Debt - Future Payments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Next 12 Months $ 626  
Year 2 640  
Year 3 656  
Year 4 655  
Year 5 688  
Thereafter 3,570  
Total principal payments $ 6,835 $ 7,139