Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

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Note 2 - Revenue From Contracts With Customers 1 (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Oct. 02, 20
Capitalized Contract Cost, Impairment Loss	$ 0	$ 0	$ 0	$ 0
Contract with Customer, Liability, Noncurrent					$ 2,300	$ 800
Contract with Customer, Liability, Revenue Recognized	4,700	4,400	9,500	13,000
Revenue, Remaining Performance Obligation, Amount	113,200		113,200
Contract with Customer, Performance Obligation Satisfied in Previous Period	(1,200)	300	400	100
Capitalized Contract Cost, Amortization	100	$ 100	367	$ 344
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total	3,800		3,800		3,600
Capitalized Contract Cost, Net, Total					400
Deferred Costs, Total					300
Other Noncurrent Assets [Member]
Capitalized Contract Cost, Net, Total	$ 1,200		$ 1,200		400
Deferred Costs, Total					$ 200
Geographic Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
Geographic Concentration Risk [Member] \| Revenue Benchmark [Member] \| Countries other than the United States [Member]
Concentration Risk, Percentage	67.00%	66.00%	60.00%	60.00%