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Note 5 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands, shares in Millions		3 Months Ended			6 Months Ended
	Feb. 01, 2016	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Number of Shares of Common Stock Potentially Issuable upon the Exercise of Stock Options and Warrants					23.4	9.1
Preferred Stock, Discount on Shares		$ 4,500			$ 4,500
Preferred Stock Dividends, Income Statement Impact		$ 532	$ 3,600		4,136
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect					(3,060)	$ (18,392)
Accounting Standards Update 2016-18 [Member]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect			200
Reclassification of Cash and Cash Equivalents to Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Member] \| Quarter Ended March 31, 2016 [Member]
Prior Period Reclassification Adjustment			$ 200
The 2016 Restructuring Plan [Member]
Severance Costs				$ 400
Former CEO's Employment Agreement [Member]
Payments for Restructuring					$ 900
Former CEO's Employment Agreement [Member] \| Stock Option Expense [Member]
Severance Costs	$ 200
Former CEO's Employment Agreement [Member] \| Not Related to Stock-based Compensation [Member]
Severance Costs	1,000
Selling, General and Administrative Expenses [Member] \| Former CEO's Employment Agreement [Member]
Severance Costs	$ 1,200