Note 13 - Shareholder Rights Plan (Details Textual) - Shareholder Rights Plan Two Thousand Eight [Member] - $ / shares |
12 Months Ended | |
---|---|---|
Dec. 31, 2016 |
Apr. 04, 2008 |
|
Exercise Price per Share | $ 75 | |
Stock Redemption Price per Share | 0.01 | |
Series B Junior Participating Preferred Stock [Member] | ||
Exercise Price per Share | 175,000 | |
Stock Redemption Price per Share | $ 0.01 | |
Maximum [Member] | ||
Stock Holders Rights Plan Exercisability Threshold Percentage | 15.00% | |
Stockholder Rights Plan Exercise Trigger Threshold Percentage Voting Stock Ownership Offer | 15.00% | |
Percentage of Beneficial Ownership Interests | 50.00% |