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Note 15 - Subsequent Events (Details Textual) - USD ($)		1 Months Ended	12 Months Ended
	Dec. 31, 2021	Jan. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2016
Loss Contingency, Accrual, Current	$ 500,000		$ 500,000	$ 0
Selling, General and Administrative Expense, Total			6,656,000	$ 6,674,000
Litigation Related to Quality of Equipment [Member]
Insurance Deductible Accrual					$ 50,000
Selling, General and Administrative Expense, Total	0		0
Litigation Related to Quality of Equipment [Member] | Accounts Payable and Accrued Liabilities [Member]
Loss Contingency, Accrual, Current	450,000		450,000
Litigation Related to Quality of Equipment [Member] | Prepaid Expenses and Other Current Assets [Member]
Loss Contingency, Receivable, Current	$ 450,000		$ 450,000
Litigation Related to Quality of Equipment [Member] | Subsequent Event [Member]
Litigation Settlement, Amount Awarded to Other Party		$ 500,000
Litigation Settlement, Amount, Insurance Policy Claim		$ 450,000

X

- Definition

The amount of accrual for insurance deductible as of the reporting period.

+ References

No definition available.

+ Details

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X

- Definition

The amount of litigation settlement that will be covered as an insurance policy claim.

+ References

No definition available.

+ Details

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X

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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X

- Definition

Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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X

- Definition

Amount of receivable related to a loss contingency accrual that is expected to be collected within one year or the normal operating cycle, if longer. For example, an insurance recovery receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12053-110248

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X

- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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