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Note 9 - Notes Payable and Capital Leases (Details Textual) - USD ($)			1 Months Ended	12 Months Ended
	May 15, 2019	Dec. 14, 2017	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Nov. 15, 2018	Oct. 08, 2018	Oct. 07, 2018	Dec. 31, 2017	Nov. 30, 2017
Potential Percent Increase in Interest Rates Contingent on Covenant Compliance				4.00%
PNC [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Liability, Notional Amount		$ 3,000,000
Derivative, Term of Contract (Year)		3 years
Derivative, Fixed Interest Rate		2.25%
BMO [Member]
Long-term Debt, Total										$ 17,000,000
PNC [Member] | Term Loan [Member]
Long-term Debt, Total				$ 3,500,000	$ 4,700,000
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
Line of Credit Facility, Temporary Over-advance	$ 0		$ 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

X

- Definition

The amount of gross proceeds that must be raised to comply with a the covenant of a line of credit facility.

+ References

No definition available.

+ Details

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X

- Definition

The amount of funding proceeds from line of credit that must be used to repay debt.

+ References

No definition available.

+ Details

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X

- Definition

The amount of temporary over-advance from a line of credit facility.

+ References

No definition available.

+ Details

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X

- Definition

The amount of fee paid and associated with the temporary over-advance of a line of credit facility.

+ References

No definition available.

+ Details

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X

- Definition

Represents the potential percentage of increase in interest rates contingent on covenant compliance.

+ References

No definition available.

+ Details

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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X

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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X

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Section S99
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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