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Note 10 - Share Based Payments (Details Textual) - USD ($) $ / shares in Units, Pure in Thousands		1 Months Ended	12 Months Ended
	Dec. 31, 2021	Jun. 30, 2015	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2007
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 0.7		$ 0.7
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 8 months 1 day
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)			150,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)			150,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)			$ 0.46	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)			$ 0.46	$ 0
Fair Value of Restricted Stock			$ 9,000	$ 1,225,000
Plain Vanilla Approach [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			10 years
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense			$ 469,000	$ 392,000
The 2006 Omnibus Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)						5,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)		2,500,000	3,000,000.0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)	3,420,708		3,420,708
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Estimated Forfeiture Rate					0.00%
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			2 years
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			3 years

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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