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Note 4 - Financing Arrangements (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2016
Interest Expense, Debt | $ 17,000 | $ 20,000 | $ 122,000 |
Operating Leases, Rent Expense | 900,000 | 1,100,000 | $ 1,000,000 |
Line of Credit Maturing February 2020 [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 20,000,000 |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.10% |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 18,300,000 | 20,000,000 |  |
Letters of Credit Outstanding, Amount | $ 1,700,000 |  |  |
Line of Credit Maturing February 2020 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.75% |  |  |
Line of Credit Maturing May 2018 [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 8,000,000 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 2,700,000 | 3,200,000 |  |
Letters of Credit Outstanding, Amount | $ 5,300,000 | 4,800,000 |  |
Line of Credit Maturing May 2018 [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
Line of Credit Facility, Remaining Borrowing Capacity | $ 800,000 | 600,000 |  |
Letters of Credit Outstanding, Amount | $ 2,200,000 | $ 2,400,000 |  |
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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -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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