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Note 1 - Nature of Business, Financial Condition and Basis of Presentation - Restructuring Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Balance
Additions	$ 5		304
Payments			(216)
Balance	88		88
Employee Severance [Member]
Balance
Additions			96
Payments			(96)
Balance
Lease Agreement [Member]
Balance
Additions			208
Payments			(120)
Balance	$ 88		$ 88