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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands		1 Months Ended	12 Months Ended			106 Months Ended	223 Months Ended
	Mar. 07, 2013	Jun. 30, 2003	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2021 USD ($) shares
Number of Operating Segments			1
Number of Reportable Segments			1
Cash Equivalents, at Carrying Value, Total \| $			$ 0	$ 0		$ 0	$ 0
Business Acquisition, Goodwill, Expected Tax Deductible Amount \| $			$ 104,400			$ 104,400	$ 104,400
Treasury Stock, Shares, Acquired (in shares)			0	0	0
Research and Development Expense, Total \| $			$ 8,500	$ 8,200	$ 8,800
The 2003 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)			1,298,721
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)							185,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)			5,500			5,500	5,500
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			768,052			768,052	768,052
The 2003 Incentive Plan [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		5 years
The 2003 Incentive Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)			0
Common Stock, Capital Shares Reserved for Future Issuance (in shares)			97,508			97,508	97,508
Nonemployee Director Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)						390,634
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)			93,171			93,171	93,171
Nonemployee Director Stock Incentive Plan [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Common Stock, Capital Shares Reserved for Future Issuance (in shares)			3,660			3,660	3,660
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)			45,604			45,604	45,604
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			20 years