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Note 7 - Financing Arrangements (Details Textual) | Mar. 31, 2012 USD ($) | Aug. 05, 2011 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
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HSBC Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |
HSBC Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50% |  |
HSBC Bank [Member] | Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 7,000,000 |  |
HSBC Bank [Member] | Five Year Term Loan [Member] |  |  |  |
Debt Instrument, Term |  | 5 years |  |
Debt Instrument, Face Amount |  | $ 2,100,000 |  |
Loans Payable to Bank |  |  | $ 280,000 | $ 700,000
HSBC Bank [Member] | HSBC Bank Mortgage Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75% |  |  |
HSBC Bank [Member] | HSBC Bank Mortgage Loan [Member] |  |  |  |
Debt Instrument, Face Amount | $ 6,000,000 |  |  |
Debt Instrument, Number of Payments | 120 |  |  |
Debt Instrument, Periodic Payment | $ 25,000 |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid | $ 3,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.9455% | 1.9108%
Long-term Debt |  |  | $ 3,565,508 | $ 3,865,508
HSBC Bank [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 9,100,000 |  |
Long-term Debt |  |  | $ 3,845,508 | $ 4,565,508

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