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Note 7 - Bank Debt (Details Textual) - USD ($)
Jun. 01, 2017
Dec. 31, 2017
Sep. 30, 2017
Term Debt [Member]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   $ 500,000  
Long-term Debt, Maturities, Repayments of Principal in Year Two   500,000  
Long-term Debt, Maturities, Repayments of Principal in Year Three   500,000  
Long-term Debt, Maturities, Repayments of Principal in Year Four   250,000  
Line of Credit [Member] | First Francis [Member]      
Repayments of Notes Payable $ 500,000    
J P Morgan Chase Bank [Member]      
Long-term Debt 2,000,000    
Debt Instrument, Periodic Payment $ 41,667    
J P Morgan Chase Bank [Member] | Prime Rate [Member]      
Debt Instrument, Basis Spread on Variable Rate 0.25%    
J P Morgan Chase Bank [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 $ 8,000,000    
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, Remaining Borrowing Capacity   $ 4,500,000 $ 3,000,000
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