Note 11 - Fair Value Accounting - Financial Assets Reported at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Goodwill, gains and (losses)	$ (1,700)	$ (2,600)	$ (4,300)	$ 0
Impairment charge	$ (1,700)	$ (2,600)	(4,300)	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Goodwill, fair value (level 3)			8,205	8,205
Goodwill, gains and (losses)			(4,300)
Balance			8,205
Impairment charge			(4,300)
Balance			$ 3,905	$ 8,205