Aggregate number of common shares reserved for future issuance.

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

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Note 10 - Equity Incentive Plans (Details Textual) - shares	1 Months Ended		12 Months Ended
	Aug. 31, 2019	Jul. 31, 2019	Dec. 31, 2019	Jul. 10, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Stock Incentive Plan 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			1,785,829	3,266,661
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	79,790
Stock Incentive Plan 2010 [Member] \| Share-based Payment Arrangement, Tranche One [Member] \| Employees and Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
Stock Incentive Plan 2010 [Member] \| August 9, 2018 [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross		254,500
Stock Incentive Plan 2010 [Member] \| June 24, 2019 [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross		1,283,032
Stock Incentive Plan 2010 [Member] \| August 8, 2019 [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross		25,581
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			190
Common Stock, Capital Shares Reserved for Future Issuance			190
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent			85.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans			0