Note 9 - Benefit Plan (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	0.25%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	1.00%
Deferred Compensation Arrangement with Individual, Maximum Base Compensation Deferral Rate	75.00%
Deferred Compensation Arrangement with Individual, Maximum Other Compensation Deferral Rate	100.00%
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage	3.00%
Deferred Compensation Plan Assets	$ 150,000	$ 40,000
The Dominican Plan [Member]
Deferred Compensation Plan Assets	$ 150,000

Maximum base compensation deferral rate of the deferred compensation arrangement.

No definition available.

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- Definition

Maximum other compensation deferral rate of the deferred compensation arrangement.

+ References

No definition available.

+ Details

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- Definition

Commitment made to pay deferred cash remuneration expressed as a percentage of the individual's base salary.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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- Details

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