Note 15 - Supplemental Disclosure for Statements of Cash Flows (Details Textual) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
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| Interest Paid, Excluding Capitalized Interest, Operating Activities | $ 3,000 | $ 4,000 |
| Stock Issued During Period, Shares, Employee Benefit Plan (in shares) | 53,315 | |
| Stock Issued During Period, Value, Employee Benefit Plan | $ 65,000 | |
| X | ||||||||||
- Definition Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan. No definition available.
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| X | ||||||||||
- Definition Value of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan. No definition available.
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