Note 5 - Business Combinations - Allocation of Purchase Price for the Acquisition of Rapid (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets acquired:
Goodwill, Ending Balance		$ 128,752	$ 128,752	$ 128,504
Liabilities assumed:
Net cash consideration		$ (0)	$ 90	110,533
Rapid [Member]
Assets acquired:
Current assets	$ 6,720
Goodwill, Ending Balance	99,836			$ 99,600
Other intangible assets	8,700
Other long-term assets	8,855
Total assets acquired	124,111
Liabilities assumed:
Current liabilities	2,067
Other long-term liabilities	85
Total liabilities assumed	2,152
Net assets acquired	121,959
Cash paid	115,378
Cash acquired	(4,755)
Net cash consideration	110,623
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	11,336
Total purchase consideration	$ 121,959