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Note 5 - Long-term Debt (Details Textual)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 19 Months Ended
Feb. 12, 2014
USD ($)
Jan. 30, 2013
USD ($)
Apr. 30, 2016
USD ($)
Oct. 31, 2015
USD ($)
Aug. 30, 2015
USD ($)
Aug. 31, 2014
USD ($)
Aug. 30, 2014
USD ($)
Aug. 30, 2015
USD ($)
$ / shares
Aug. 31, 2014
USD ($)
Aug. 30, 2014
USD ($)
Aug. 30, 2015
USD ($)
PNC Bank National Association [Member] | Letter of Credit [Member]                      
Line of Credit Facility, Maximum Borrowing Capacity $ 2,000 $ 2,000                  
PNC Bank National Association [Member] | To Finance a Special Dividend Paid to Shareholders [Member]                      
Proceeds from Lines of Credit                     $ 52,000
PNC Bank National Association [Member] | To Continue the Loan [Member]                      
Proceeds from Lines of Credit                     $ 52,000
PNC Bank National Association [Member] | Scenario, Forecast [Member] | Debt Instrument, Redemption, Period Two [Member]                      
Number of Quarterly Installments     8                
Debt Instrument, Periodic Payment, Principal     $ 3,750                
PNC Bank National Association [Member] | Standby Letters of Credit [Member]                      
Number of Standby Letter of Credit Issued                     2
Long-term Line of Credit         $ 1,075     $ 1,075     $ 1,075
PNC Bank National Association [Member] | Subsequent Event [Member] | Debt Instrument, Redemption, Period One [Member]                      
Number of Quarterly Installments       2              
Debt Instrument, Periodic Payment, Principal       $ 2,500              
PNC Bank National Association [Member] | London Interbank Offered Rate (LIBOR) [Member]                      
Debt Instrument, Basis Spread on Variable Rate               1.10%      
PNC Bank National Association [Member] | Federal Funds Rate [Member]                      
Debt Instrument, Basis Spread on Variable Rate               0.50%      
PNC Bank National Association [Member] | Daily LIBOR Plus [Member]                      
Debt Instrument, Basis Spread on Variable Rate               1.00%      
PNC Bank National Association [Member]                      
Line of Credit Facility, Expiration Period 4 years 5 years                  
Line of Credit Facility, Maximum Borrowing Capacity $ 104,000 $ 52,000                  
Proceeds from Lines of Credit   $ 52,000                  
Long-term Line of Credit         $ 89,000     $ 89,000     $ 89,000
Repayments of Long-term Lines of Credit               $ 5,000      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage               0.20%      
Line of Credit Facility, Interest Rate at Period End         1.37%     1.37%     1.37%
Interest Expense         $ 356   $ 360 $ 725   $ 713  
Special Dividend [Member] | Maximum [Member]                      
Dividend Covenant, Maximum Quarterly Dividend | $ / shares               $ 2.50      
Special Dividend [Member] | Minimum [Member]                      
Dividend Covenant, Maximum Quarterly Dividend | $ / shares               $ 1      
Debt Covenant Required for Quarter One [Member]                      
Maximum Funded Debt Ratio         3.85     3.85     3.85
Debt Covenant Required for Quarter Two [Member]                      
Maximum Funded Debt Ratio         3.55     3.55     3.55
Debt Covenant Required for Quarter Three and Four [Member]                      
Maximum Funded Debt Ratio         3.5     3.5     3.5
Debt Covenant Required for Year Two [Member]                      
Maximum Funded Debt Ratio         3     3     3
Debt Covenant Required for All Period Thereafter [Member]                      
Maximum Funded Debt Ratio         2.25     2.25     2.25
Quick Ratio         3     3     3
Debt Covenant Required for the Period December 1, 2014 through November 27, 2016 [Member]                      
Quick Ratio         6.5     6.5     6.5
Maximum [Member]                      
Dividend Covenant, Maximum Quarterly Dividend | $ / shares               $ 0.10      
Nelco Products Pte Ltd [Member]                      
Pledge of Stock Percentage as Guarantee for Credit Agreement               65.00%      
Minimum Interest Coverage Ratio         1.1     1.1     1.1
Debt Agreement, Minimum Domestic Liquid Assets Required         $ 25,000     $ 25,000     $ 25,000
Interest Expense         $ 356 $ 360   $ 725 $ 713