Minimum amount of operating income to meet the performance condition.

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section S99
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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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-Publisher FASB
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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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

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Number of shares issued under share-based payment arrangement.

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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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Note 4 - Stock-based Compensation (Details Textual) - Restricted Stock [Member] - USD ($)	1 Months Ended	3 Months Ended
	Oct. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		28,191
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 3,291,258
Operating Expense [Member]
Share-based Payment Arrangement, Expense		185,825	$ 28,969
Janet Carr [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	644,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	460,000
Share-based Payment Arrangement, Expensed and Capitalized, Amount, Total		$ 0
Janet Carr [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	92,000
Share-based Compensation Arrangement by Share-based Payment Award, Minimum Operating Income	$ 12,000,000
Janet Carr [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	92,000
Share-based Compensation Arrangement by Share-based Payment Award, Minimum Operating Income	$ 14,000,000
Restricted Stock Plan [Member] \| Executive Officers, Non-employee Directors and Other Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				300,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		28,191