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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
Dec. 31, 2018
Dec. 31, 2017
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months         $ 1,333,333  
Long-term Debt, Maturities, Repayments of Principal in Year Two         1,333,333  
Long-term Debt, Maturities, Repayments of Principal in Year Three         1,333,333  
Long-term Debt, Maturities, Repayments of Principal in Year Four         1,333,333  
Revolving Credit Facility [Member] | J P Morgan Chase Bank [Member]            
Line of Credit Facility, Remaining Borrowing Capacity         $ 7,800,000 $ 4,500,000
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   Dec. 01, 2022        
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