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Note 7 - Financing Arrangements (Details Textual) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2012 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Long-term Debt |  | $ 3,265,508 | $ 3,845,508
HSBC Bank Mortgage Loan [Member] | HSBC Bank [Member] |  |  |
Debt Instrument, Number of Payments | 120 |  |
Debt Instrument, Periodic Payment | $ 25,000 |  |
Long-term Debt |  | $ 3,300,000 | $ 3,600,000
Debt Instrument, Interest Rate, Stated Percentage |  | 2.1765% | 1.9455%
HSBC Bank Mortgage Loan [Member] | HSBC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |
HSBC Bank [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 7,000,000 |

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