XML 70 R57.htm IDEA: XBRL DOCUMENT
v3.21.2

Note 10 - Stock-based Compensation - Stock Option Activity (Details) (Parentheticals) - shares | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Options exercisable (in shares) | 142,230 | 204,630

X
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant