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Note 7 - Bank Debt (Details Textual) - USD ($)
9 Months Ended
Jul. 05, 2019
Jul. 05, 2018
Jun. 01, 2017
Sep. 30, 2018
Line of Credit [Member] | First Francis [Member]        
Repayments of Notes Payable     $ 500,000  
J P Morgan Chase Bank [Member] | Term Debt [Member]        
Long-term Debt, Total   $ 6,000,000    
Debt Instrument, Periodic Payment, Total       $ 111,111
Debt Instrument, Maturity Date   Jun. 01, 2021    
J P Morgan Chase Bank [Member] | Term Debt [Member] | Prime Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.25%    
J P Morgan Chase Bank [Member] | Term Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   2.25%    
J P Morgan Chase Bank [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 12,000,000    
Line of Credit Facility, Percent of Eligible Accounts   80.00%    
Line of Credit Facility, Percent of Eligible Progress Billing Accounts   50.00%    
Line of Credit Facility, Percent of Eligible Inventory   50.00%    
Line of Credit Facility, Commitment Fee Percentage   0.25%    
Line of Credit Facility, Expiration Date   Jun. 01, 2020    
J P Morgan Chase Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.00%    
J P Morgan Chase Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate   2.00%    
J P Morgan Chase Bank [Member] | Letter of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 3,000,000    
J P Morgan Chase Bank [Member] | Credit Line for Capital Expenditures [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,000,000    
Line of Credit Facility, Expiration Date   Jul. 05, 2019    
J P Morgan Chase Bank [Member] | Credit Line for Capital Expenditures [Member] | Maximum [Member] | Scenario, Forecast [Member]        
Debt Instrument, Term 5 years