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Note 7 - Bank Debt (Details Textual) - USD ($)
Jun. 01, 2017
Jun. 30, 2017
Long-term Debt   $ 2,000,000
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, Percent of Eligible Inventory 50.00%  
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, Commitment Fee Percentage 0.25%  
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