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Note 8 - Notes Payable and Capital Leases (Details Textual) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 14, 2017 USD ($) | Dec. 31, 2017 USD ($) | Nov. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Potential Percent Increase in Interest Rates Contingent on Covenant Compliance |  | 2.00% |  |
PNC [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative Liability, Notional Amount | $ 3,000,000 |  |  |
Derivative, Term of Contract | 3 years |  |  |
Derivative, Fixed Interest Rate | 2.25% |  |  |
Maximum [Member] |  |  |  |
Fixed Charge Coverage Ratio |  | 1.1 |  |
BMO [Member] |  |  |  |
Long-term Debt |  |  | $ 17,000,000 |
PNC [Member] | Term Loan [Member] |  |  |  |
Long-term Debt |  | $ 6,000,000 |  |
PNC [Member] | PNC Agreements [Member] | Revolving Credit Facility [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 18,000,000 |  |
PNC [Member] | PNC Agreements [Member] | Term Loan [Member] |  |  |  |
Long-term Debt |  | $ 6,000,000 |  |

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