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Note 7 - Long-term Debt (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Letters of Credit Outstanding, Amount | $ 430,000 | $ 700,000
Line of Credit [Member] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 60,000,000 |
Line of Credit Facility, Interest Rate at Period End | 2.96% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.25% |
Average Daily Borrowings Amount Unused Fee Trigger | $ 18,000,000 |
Ratio of Indebtedness to Net Capital |  | 4
Line of Credit Facility, Outstanding Advances | 17,400,000 | $ 10,900,000
Letters of Credit Outstanding, Amount | 400,000 | $ 700,000
Line of Credit Facility, Remaining Borrowing Capacity | $ 42,600,000 |
Line of Credit [Member] | Equipment Financing [Member] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 3.65% |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |

X
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X
- Definition Amount of outstanding advances under the credit facility. + References No definition available. + Details
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X
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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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X
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