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Note 6 - Long-term Debt (Details Textual) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2011 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Term Loan [Member] |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  | $ 102,000 |  | $ 102,000
Long-term Debt | [1],[2],[3] |  | 4,735,000 |  | 5,030,000
PNC Bank [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 2,350,000 |  |
Line of Credit Facility Reduction |  |  | 1,250,000 |  |
Revised Loan Agreement [Member] | PNC Bank [Member] |  |  |  |  |
Debt Instrument, Termination Notice |  | 90 days |  |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | On or Before March 23, 2017 [Member] |  |  |  |  |
Debt Instrument Percentage of Total Finacing to be Paid Upon Early Retirement of Debt Obligations |  | 1.00% |  |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | After March 23, 2017 But Prior to or on March 23, 2018 [Member] |  |  |  |  |
Debt Instrument Percentage of Total Finacing to be Paid Upon Early Retirement of Debt Obligations |  | 0.50% |  |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | After March 23, 2018 But Prior to or on March 23, 2019 [Member] |  |  |  |  |
Debt Instrument Percentage of Total Finacing to be Paid Upon Early Retirement of Debt Obligations |  | 0.25% |  |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | After March 23, 2019 [Member] |  |  |  |  |
Debt Instrument Percentage of Total Finacing to be Paid Upon Early Retirement of Debt Obligations |  | 0.00% |  |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  | $ 101,600 |  | $ 190,000 |
Long-term Debt |  | 6,100,000 |  |  |
Term Loan [Member] |  |  |  |  |
Debt Issuance Costs, Net |  |  | 142,000 |  | $ 151,000
Amended Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 12,000,000 |  |  |
Amended Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |  |  |
Amended Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.00% |  |  |
Amended Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] | Prime Rate [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% |  |  |
Amended Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.50% |  |  |
Amendment 4 [Member] | PNC Bank [Member] | Term Loan [Member] |  |  |  |  |
Debt Instrument, Term |  | 7 years |  |  |
Amendment to the Revised Loan Agreement [Member] | PNC Bank [Member] |  |  |  |  |
Line of Credit Facility Reduction |  |  | 2,000,000 |  |
Line of Credit Facility Reduction, Additional Reduction |  |  | $ 750,000 |  |
[1] | Net of debt issuance costs of ($142,000) and ($151,000) at March 31, 2017 and December 31, 2016, respectively.
[2] | Our revolving credit facility is collateralized by our accounts receivable and our term loan is collateralized by our property, plant, and equipment.
[3] | Prior to April 1, 2016, the monthly installment payment under the term loan was approximately $190,000.

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