Adjustments to additional paid in capital reclassification of share based compensation to liability.

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Deferred Compensation Arrangement with Individual Shares Outstanding.

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Period of time over which awards were distributed from time of vesting.

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Amount of increase to additional paid-in capital (APIC) for recognition of cost for restricted stock unit under share-based payment arrangement.

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

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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

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

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of new stock issued during the period.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Stock-Based Compensation - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended		12 Months Ended
	Sep. 09, 2015	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment
Stock Repurchased During Period, Shares			250,197		200,803
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			310,000		295,500
Deferred Compensation Arrangement with Individual Shares Outstanding			215,259
Share-based Payment Arrangement, Employee [Member]
Share-based Compensation Arrangement by Share-based Payment
Number of Shares, Granted			(310,000)		(295,500)
Other Employees [Member]
Share-based Compensation Arrangement by Share-based Payment
Restricted Stock or Unit Expense			$ 64,000
Employees and executive officers [Member]
Share-based Compensation Arrangement by Share-based Payment
Stock Issued During Period, Shares, New Issues			473,343
Stock Repurchased During Period, Shares			224,442
Board Members [Member]
Share-based Compensation Arrangement by Share-based Payment
Stock Issued During Period, Shares, New Issues			21,627
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment
Allocated Share-based Compensation Expense			$ 45,000	$ 91,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options			661,000
Adjustments to Additional Paid in Capital Reclassification Of Share Based Compensation To Liability			$ 151,000	$ 177,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			310,000
Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			2 years
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Distribution Period			7 years
Restricted Stock Units (RSUs) [Member] \| Other Employees [Member]
Share-based Compensation Arrangement by Share-based Payment
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition			$ 20,000
2015 Stock Incentive Plan[Member]
Share-based Compensation Arrangement by Share-based Payment
Number of Shares, Granted			0
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	800,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		1,000,000	1,500,000