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Note 9 - Long-term Debt (Details Textual)
3 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Apr. 01, 2017
USD ($)
Letters of Credit Outstanding, Amount $ 1,800,000 $ 1,800,000  
Amortization of Debt Issuance Costs 16,000 32,000 $ 32,000
Accumulated Amortization, Debt Issuance Costs 4,600,000 4,600,000  
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity 100,000,000 100,000,000  
Line of Credit Facility, Remaining Borrowing Capacity 100,000,000 100,000,000  
Long-term Line of Credit 0 0  
Line of Credit Facility, Current Borrowing Capacity $ 84,400,000 $ 84,400,000  
Debt Instrument, Interest Rate, Increase (Decrease)   2.00%  
Fixed Charge Coverage Ratio   1.1  
Credit Facility, Liquidity Amount   $ 12,500,000  
Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate   0.50%  
Revolving Credit Facility [Member] | Base Rate [Member]      
Line of Credit Facility, Interest Rate at Period End 0.25% 0.25%  
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]      
Debt Instrument, Basis Spread on Variable Rate   0.25%  
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]      
Debt Instrument, Basis Spread on Variable Rate   0.75%  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Line of Credit Facility, Interest Rate at Period End 1.25% 1.25%  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument, Basis Spread on Variable Rate   1.25%  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]      
Debt Instrument, Basis Spread on Variable Rate   1.75%