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Note 5 - Concentration of Credit Risk (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018
Cash, FDIC Insured Amount	$ 250	$ 250
Number Of Banks	11	10
Cash Balances On Deposit FDIC Insured Amount	$ 92,800	$ 36,400
Cash Deposit with Foreign Banks	$ 122,500	$ 145,700
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Customers	50	50	50
Concentration Risk, Percentage	3.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Top Fifty Customers [Member]
Concentration Risk, Percentage	33.00%	33.00%	34.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Individual Customer [Member]
Number of Customers	0	0	0
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Individual Customer [Member]
Number of Customers	0	0
Concentration Risk, Percentage	2.00%	3.00%

X

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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X

- Definition

Represents amount of cash balances on deposit for FDIC insured.

+ References

No definition available.

+ Details

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X

- Definition

Represents cash deposit with foreign banks.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

The number of banks the company has cash balances on deposit that exceeds the balance insured by the FDIC limit

+ References

No definition available.

+ Details

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X

- Definition

The number of customers that represents the majority of business done with the company.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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