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Note 9 - Notes Payable and Capital Leases (Details Textual) |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2019 USD ($) | Dec. 14, 2017 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 15, 2018 USD ($) | Oct. 08, 2018 USD ($) | Oct. 07, 2018 USD ($) | Dec. 31, 2017 USD ($) | Nov. 30, 2017 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, Total |  |  |  |  |  |  |  |  | $ 17,000,000
PNC [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  | $ 4,700,000 |  |  |  | $ 6,000,000 |
PNC [Member] | PNC Agreements [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | 18,000,000 |
Line of Credit Facility, Funding Proceeds That Must be Used to Repay Debt |  |  |  |  |  | $ 2,000,000 | $ 5,000,000 |  |
Line of Credit Facility, Covenant, Gross Proceeds to be Raised |  |  |  |  | $ 7,500,000 |  |  |  |
PNC [Member] | PNC Agreements [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Temporary Over-advance | $ 0 |  |  |  |  |  |  |  |
PNC [Member] | PNC Agreements [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Temporary Over-advance |  |  | $ 1,200,000 |  |  |  |  |  |
Line of Credit Facility, Temporary Over-advance, Fee |  |  | $ 250,000 |  |  |  |  |  |
PNC [Member] | PNC Agreements [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  | $ 6,000,000 |

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