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Note 5 - Credit Facilities (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interest Expense, Debt, Total | $ 18,000 | $ 1,000 | $ 1,000
Line of Credit Maturing February 2022 [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 20,000,000.0 |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.10% |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 19,900,000 | 19,900,000 |
Letters of Credit Outstanding, Amount | $ 100,000 | 100,000 |
Line of Credit Maturing February 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.75% |  |
Line of Credit Maturing May 2021 [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 8,000,000.0 |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 3,600,000 |
Letters of Credit Outstanding, Amount |  | 4,400,000 |
Line of Credit Maturing May 2021 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.75% |  |
Bank Guarantee [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 3,000,000.0 |  |
Line of Credit Facility, Remaining Borrowing Capacity | 1,500,000 | 1,000,000.0 |
Letters of Credit Outstanding, Amount | $ 1,500,000 | $ 2,000,000.0 |
Line of Credit Facility, Interest Rate at Period End | 1.75% |  |

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- 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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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- 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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- 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=120391452&loc=d3e13212-122682 + Details
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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 + Details
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- 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=120391452&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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