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Note 1 - Nature of Business, Financial Condition and Basis of Presentation - Restructuring Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Balance
Additions	$ (50)		254
Payments			(254)
Balance
Employee Severance [Member]
Balance
Additions			96
Payments			(96)
Balance
Lease Agreement [Member]
Balance
Additions			158
Payments			(158)
Balance