Note 4 - Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Contract with Customer, Asset and Liability [Table Text Block]

Contract Assets and Liabilities	December 31,
	2019		2018*
Trade receivables, included in accounts receivable, net of allowances for bad debts of $0 * *	$	11,902	$	15,496
Contract assets, included in accounts receivable		1,067		798
Contract liabilities, included in Deferred revenue - short-term		5,030		4,374
Contract liabilities, included in Deferred revenue - long-term		17,151		15,959

Disaggregation of Revenue [Table Text Block]

Di sa ggregation of revenue - contractual and non-contractual
	Twelve months ended December 31,
	2019			2018
Contract revenue from customers with > 1 year arrangements	$	40,156		$	60,721
Contract revenue from customer with < 1 year arrangement		204,271			243,634
Revenue from non-contractual arrangements		222			222
BTC rebate		(39,423	)		(13,559	)
Total revenue	$	205,226		$	291,018

Timing of revenue
	Twelve months ended December 31,
	2019		2018
Bill-and-hold revenue	$	51,700	$	44,924
Non-bill-and-hold revenue		153,526		246,094
Total revenue	$	205,226	$	291,018

Revenue from External Customers by Geographic Areas [Table Text Block]

	Twelve months ended December 31:
	2019		2018		2017
United States	$	203,470	$	289,019	$	271,635
All Foreign Countries		1,756		1,999		3,391
Total	$	205,226	$	291,018	$	275,026