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Note 6 - Realignment of Goals and Objectives and New Development Focus (Details Textual) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Restructuring and Related Cost, Expected Cost | $ 10.4
Payments for Restructuring | 2.2
Restructuring Plan [Member] |
Restructuring Charges | 7.8
Restructuring Plan [Member] | Accrued Payroll and Employee Liabilities [Member] |
Restructuring and Related Cost, Cost Incurred to Date | 2.7
Restructuring Plan [Member] | Research and Development Expense [Member] |
Restructuring Charges | 6.7
Restructuring Plan [Member] | General and Administrative Expense [Member] |
Restructuring Charges | 1.0
Restructuring Plan [Member] | Selling and Marketing Expense [Member] |
Restructuring Charges | 0.1
Restructuring Plan [Member] | Employee Severance [Member] |
Restructuring and Related Cost, Expected Cost | 6.4
Restructuring Plan [Member] | Accelerated Non-Cash Stock Option Expense [Member] |
Restructuring and Related Cost, Expected Cost | 4.0
Restructuring Plan [Member] | Employee Related Liabilities [Member] |
Restructuring and Related Cost, Expected Cost Remaining | $ 2.6

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