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Note 7 - Long-term Debt Instruments (Details) (Parentheticals) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Revolving Credit [Member] |  |  |  |
Effective interest rate |  | 4.40% | [1],[2] |
Term Loan [Member] |  |  |  |
Effective interest rate |  | 3.70% | [1],[2] |
Debt Instrument, Periodic Payment, Principal |  | $ 102,000 |  | $ 102,000
Promissory Note Dated August 2, 2013 [Member] |  |  |  |
Effective interest rate | [3],[4] | 2.99% |  | 2.99%
Debt Instrument, Periodic Payment, Principal |  | $ 125,000 |  | $ 125,000
Capital Lease Obligations [Member] |  |  |  |
Effective interest rate |  | 6.00% |  | 6.00%
[1] | Our Revolving Credit facility is collateralized by our accounts receivable and our Term Loan is collateralized by our property, plant, and equipment.
[2] | See below "Revolving Credit and Term Loan Agreement" for monthly payment interest options. Prior to April 1, 2016, the monthly installment payment under the Term Loan was approximately $190,000.
[3] | Net of debt discount of ($7,000) and ($50,000) at June 30, 2016 and December 31, 2015, respectively. See “Promissory Notes and Installment Agreements” below for additional information.
[4] | Uncollateralized note.

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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