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Note 6 - Debt - Future Minimum Principal Payments of Debt (Details) - USD ($)
$ in Thousands
May. 31, 2015
Real Estate Loan [Member]  
FY 2016 $ 1,005
FY 2017 1,047
FY 2018 1,089
FY 2019 1,134
FY 2020 1,180
Thereafter 9,717
Total 15,172
M and E Loans [Member]  
FY 2016 3,973
FY 2017 4,130
FY 2018 4,293
FY 2019 4,461
FY 2020 $ 5,050
Thereafter  
Total $ 21,907
Term Loan [Member]  
FY 2016 $ 3,000
FY 2017  
FY 2018  
FY 2019  
FY 2020  
Thereafter  
Total $ 3,000
Industrial Revenue Bonds [Member]  
FY 2016 375
FY 2017 390
FY 2018 400
FY 2019 410
FY 2020 425
Thereafter 440
Total 2,440
FY 2016 8,353
FY 2017 5,567
FY 2018 5,782
FY 2019 6,005
FY 2020 6,655
Thereafter 10,157
Total $ 42,519