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Note 7 - Financing Arrangements (Details Textual)	Mar. 31, 2012 USD ($)	Aug. 05, 2011 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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