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

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Number of share options (or share units) exercised during the current period.

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Note 5 - Stock-based Compensation (Details Textual) - USD ($)	2 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Apr. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance	16,000	16,000		16,000			18,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				0	2,750
Share-based Payment Arrangement, Expense		$ 1,900	$ 3,600	$ 3,800	$ 6,500
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	$ 8,800	8,800		$ 8,800
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 0	$ 0		$ 0
The 1995 Incentive Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance	16,000	16,000		16,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						102,157
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	750
The 2019 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	102,907	102,907		102,907		102,157
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				0
Maximum [Member] \| The 1995 Incentive Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	442,750	442,750		442,750