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7. Long-Term Debt (Details) - Unsecured Debt [Member] - USD ($)
Apr. 30, 2017
May 01, 2016
Feb. 01, 2016
7. Long-Term Debt (Details) [Line Items]      
Debt Instrument, Face Amount     $ 60,000,000
Debt Issuance Costs, Gross   $ 165,000  
Debt Issuance Costs, Net $ 112,000