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

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Note 5 - Stock Based Compensation (Details Textual) - USD ($)				12 Months Ended
	Dec. 18, 2019	Oct. 29, 2019	Apr. 13, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Expense				$ 139,000	$ 0
Share-based Payment Arrangement, Expense, Tax Benefit				$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance				161,333	178,000	188,033
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				0	0
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares					0
Plan 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				300,000
Plan 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance				3,333
Chief Executive Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| Plan 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		50,000	50,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	25,000
Chief Executive Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| Plan 2017 [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	25,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance		25,000
Chief Executive Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| Plan 2017 [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance		25,000