The amount of a reclassification adjustment made to current period financial statement amounts.

No definition available.

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Represents the amount of gains from revaluating warrants during the period.

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Period from grant date that a warrant expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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No definition available.

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Amount of expense for salary and wage arising from service rendered by officer. Excludes allocated cost, labor-related nonsalary expense, and direct and overhead labor cost included in cost of good and service sold.

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

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

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Number of shares issued under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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Note 3 - Stock-based Compensation Plans and Warrants (Details Textual) - USD ($)				1 Months Ended		3 Months Ended		12 Months Ended		54 Months Ended
	Jan. 01, 2019	Jun. 10, 2014	Dec. 18, 2009	May 31, 2017	Jun. 30, 2014	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Jun. 09, 2014
Share-based Payment Arrangement, Expense						$ 122,000	$ 105,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance						492,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period						0
Current Period Reclassification Adjustment	$ 865,000					$ 865,000
Reclassification of Warrant Liability to Additional Paid-in Capital [Member]
Current Period Reclassification Adjustment						$ 865,000
Gains from Revaluating Warrants								$ 1,500,000	$ 500,000
2017 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				362,500
Warrant Term				5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights				$ 14.94		$ 14.69
Warrants and Rights Outstanding				$ 2,900,000
Common Stock [Member]
Current Period Reclassification Adjustment
Additional Paid-in Capital [Member]
Current Period Reclassification Adjustment						2,896,000
Additional Paid-in Capital [Member] \| Reclassification of Warrant Liability to Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	2,000,000
Retained Earnings [Member] \| Reclassification of Warrant Liability to Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 2,000,000
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense						$ 0	$ 0
Two Thousand Nine Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		850,000	850,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period					45,235
Two Thousand Nine Equity Incentive Plan [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period										297,265
Two Thousand Nine Equity Incentive Plan [Member] \| Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period										507,500
Two Thousand Nine Equity Incentive Plan [Member] \| Share-based Payment Arrangement, Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			2 years
Twenty Fourteen Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		675,000
Twenty Fourteen Equity Incentive Plan [Member] \| Outside Director [Member] \| Accrues Yearly [Member]
Salary and Wage, Officer, Excluding Cost of Good and Service Sold		$ 30,000
Share-based Payment Arrangement, Expense		20,000
Twenty Fourteen Equity Incentive Plan [Member] \| Outside Director [Member] \| Accrues Quarterly [Member]
Salary and Wage, Officer, Excluding Cost of Good and Service Sold		7,500
Share-based Payment Arrangement, Expense		$ 5,000
Two Thousand Fourteen Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						675,000
Two Thousand Fourteen Equity Incentive Plan [Member] \| Directors, Consultants and Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period						649,772
Two Thousand Fourteen Equity Incentive Plan [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period						10,224