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Note 7 - Bank Debt (Details Textual)
Jun. 01, 2017
USD ($)
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 2,000,000
Debt Instrument, Periodic Payment, Total $ 41,667
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 $ 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, 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