Represents the maximum offering price for issuance of common stock.

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The net cash inflow from the additional capital contribution to the entity after payment for issuance costs.

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Average per share or per unit amount of equity securities issued.

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash inflow from the additional capital contribution to the entity.

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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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No definition available.

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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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No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Per share or per unit amount of equity securities issued.

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No definition available.

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Number of new stock issued during the period.

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Note 12 - Stockholders' Equity (Details Textual) - USD ($)				1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 04, 2020	Mar. 25, 2020	Dec. 29, 2017	May 31, 2021	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	May 19, 2020	Dec. 13, 2019	May 30, 2019	Jun. 22, 2018	May 31, 2017
Proceeds from Issuance of Common Stock, Net						$ 6,832,000	$ 10,839,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	565,500
Share-based Payment Arrangement, Expense						$ 2,560,000	$ 880,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 5.94
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares)						535,450
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)							$ 5.05
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total						$ 262,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)						1 year
Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares)				490,000
Executive Officer [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Accelerated Cost					$ 2,008,000
Amended 2016 Plan [Member
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)										392,500	132,500	60,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)						41,386
Equity Incentive Plan 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)			1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)						30,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)			280,000
Registered Direct Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		1,000,002
Shares Issued, Price Per Share (in dollars per share)		$ 3.50
Proceeds from Issuance of Common Stock		$ 3,500,000
Payments of Stock Issuance Costs		$ 393,000
At The Market Offering Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)							2,620,652
Proceeds from Issuance of Common Stock							$ 8,224,000
Payments of Stock Issuance Costs							$ 493,000
Maximum Offering Price for Issuance of Common Stock								$ 15,280,313	$ 4,400,000
Shares Issued, Average Price Per Share (in dollars per share)							$ 3.14
Proceeds from Issuance of Common Stock, Net							$ 7,731,000