Note 10 - Fair Value Accounting - Financial Assets Reported at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill, gains and (losses)	$ 0	$ (4,500)
Goodwill recorded in connection with the HCS Acquisition		12,705
Impairment charge	0	(4,500)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Goodwill, fair value (level 3)	8,205	8,205
Goodwill, gains and (losses)		(4,500)
Goodwill, beginning balance	$ 8,205	0
Goodwill recorded in connection with the HCS Acquisition		12,705
Impairment charge		(4,500)
Goodwill, ending balance		$ 8,205