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Stock based compensation, options and warrants (Narrative) (Details) | 6 Months Ended
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Jun. 30, 2019 USD ($)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |
Unrecognized compensation cost | $ 300,000
Unrecognized compensation cost, period | 5 months
Restricted Stock [Member] |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |
Fair value of restricted stock granted | $ 100,000

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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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