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Note 7 - Long-term Debt (Details Textual) | 12 Months Ended
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Dec. 31, 2018 USD ($)
Letters of Credit Outstanding, Amount | $ 700,000
Line of Credit [Member] |
Line of Credit Facility, Maximum Borrowing Capacity | $ 40,000,000
Line of Credit Facility, Interest Rate at Period End | 3.85%
Ratio of Indebtedness to Net Capital | 4
Line of Credit Facility, Outstanding Advances | $ 10,900,000
Letters of Credit Outstanding, Amount | 700,000
Line of Credit Facility, Remaining Borrowing Capacity | $ 29,100,000
Line of Credit [Member] | Equipment Financing [Member] |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 3.61%
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |
Debt Instrument, Basis Spread on Variable Rate | 1.50%

X
- Definition Amount of outstanding advances under the credit facility. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The effective interest rate at the end of the reporting period. + 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=6877327&loc=d3e13212-122682 + Details
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X
- 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=6877327&loc=d3e13212-122682 + Details
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X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average interest rate of long-term debt outstanding calculated at point in time. + References No definition available. + Details
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X
- Definition Indebtedness divided by net capital. + References No definition available. + Details
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- Details
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