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Note 5 - Stock-based Compensation (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($)
Number of Stock-based Compensation Plans in Effect	3		3
Share-based Payment Arrangement, Expense | $	$ 49,000	$ 18,000	$ 129,000	$ 44,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $	$ 476,000		$ 476,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares	47,000		80,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | shares			0

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Number of stock-based compensation plans in effect

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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