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Note 14 - Shareholder Rights Plan (Details Textual) - Shareholder Rights Plan Two Thousand Eight [Member] - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Apr. 04, 2008
Exercise Price per Share | $ 75 |
Stock Redemption Price per Share | 0.01 |
Series B Junior Participating Preferred Stock [Member] |  |
Stock Redemption Price per Share | $ 0.01 |
Preferred Stock, Capital Shares Reserved for Future Issuance | 175,000 |
Minimum [Member] |  |
Stock Holders Rights Plan Exercisability Threshold Percentage |  | 15.00%
Maximum [Member] |  |
Stockholder Rights Plan Exercise Trigger Threshold Percentage Voting Stock Ownership Offer |  | 15.00%
Percentage of Beneficial Ownership Interests | 50.00% |

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- Definition the per share amount at which grantees can acquire shares of common stock by exercise of stock. + References No definition available. + Details
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- Definition Aggregate number of nonredeemable preferred shares reserved for future issuance. + 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 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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