Note 7 - Leases (Tables)	3 Months Ended
Mar. 31, 2019
Notes Tables
Lessee, Lease, Liability, Maturity [Table Text Block]	<div style="display: inline; font-family: times new roman; font-size: 10pt"><table style="border-collapse: collapse; font: 10pt Times New Roman, Times, Serif; min-; min-width: 700px;" cellspacing="0" cellpadding="0" align="center"> <tr style="vertical-align: bottom"> <td style="white-space: nowrap; border-bottom: Black 1pt solid; text-align: left"><div style=" font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left"><div style="display: inline; font-weight: bold;">Remaining Maturities of Lease Liabilities</div></div> <div style=" font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left"><div style="display: inline; font-weight: bold;">Year Ending December 31,</div></div></td> <td style="font-weight: bold; padding-bottom: 1pt"> </td> <td colspan="3" style="white-space: nowrap; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Operating Leases</td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="width: 85%; text-align: left">2019</td> <td style="width: 1%"> </td> <td style="width: 1%; text-align: left">$</td> <td style="width: 12%; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">1,096</div></td> <td style="white-space: nowrap; width: 1%; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="text-align: left">2020</td> <td> </td> <td style="text-align: left"> </td> <td style="text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">1,300</div></td> <td style="white-space: nowrap; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="text-align: left">2021</td> <td> </td> <td style="text-align: left"> </td> <td style="text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">543</div></td> <td style="white-space: nowrap; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="text-align: left">2022</td> <td> </td> <td style="text-align: left"> </td> <td style="text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">505</div></td> <td style="white-space: nowrap; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="text-align: left">2023</td> <td> </td> <td style="text-align: left"> </td> <td style="text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">512</div></td> <td style="white-space: nowrap; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="padding-bottom: 1pt; text-align: left">Thereafter</td> <td style="padding-bottom: 1pt"> </td> <td style="border-bottom: Black 1pt solid; text-align: left"> </td> <td style="border-bottom: Black 1pt solid; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">7,766</div></td> <td style="white-space: nowrap; border-bottom: Black 1pt solid; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="text-align: left; padding-left: 10pt">Total lease payments</td> <td> </td> <td style="text-align: left"> </td> <td style="text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">11,722</div></td> <td style="white-space: nowrap; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="text-align: left; padding-bottom: 1pt">Less imputed interest</td> <td style="padding-bottom: 1pt"> </td> <td style="border-bottom: Black 1pt solid; text-align: left"> </td> <td style="border-bottom: Black 1pt solid; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">6,513</div></td> <td style="white-space: nowrap; border-bottom: Black 1pt solid; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="padding-bottom: 2.25pt; text-align: left; padding-left: 10pt">Total</td> <td style="padding-bottom: 2.25pt"> </td> <td style="border-bottom: Black 2.25pt double; text-align: left">$</td> <td style="border-bottom: Black 2.25pt double; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">5,209</div></td> <td style="white-space: nowrap; border-bottom: Black 2.25pt double; text-align: left"> </td> </tr> </table></div>

Note 7 - Leases (Tables)

3 Months Ended

Mar. 31, 2019

Lessee, Lease, Liability, Maturity [Table Text Block]

<div style="display: inline; font-family: times new roman; font-size: 10pt"><table style="border-collapse: collapse; font: 10pt Times New Roman, Times, Serif; min-; min-width: 700px;" cellspacing="0" cellpadding="0" align="center"> <tr style="vertical-align: bottom"> <td style="white-space: nowrap; border-bottom: Black 1pt solid; text-align: left"><div style=" font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left"><div style="display: inline; font-weight: bold;">Remaining Maturities of Lease Liabilities</div></div> <div style=" font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left"><div style="display: inline; font-weight: bold;">Year Ending December 31,</div></div></td> <td style="font-weight: bold; padding-bottom: 1pt"> </td> <td colspan="3" style="white-space: nowrap; font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Operating Leases</td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="width: 85%; text-align: left">2019</td> <td style="width: 1%"> </td> <td style="width: 1%; text-align: left">$</td> <td style="width: 12%; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">1,096</div></td> <td style="white-space: nowrap; width: 1%; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="text-align: left">2020</td> <td> </td> <td style="text-align: left"> </td> <td style="text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">1,300</div></td> <td style="white-space: nowrap; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="text-align: left">2021</td> <td> </td> <td style="text-align: left"> </td> <td style="text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">543</div></td> <td style="white-space: nowrap; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="text-align: left">2022</td> <td> </td> <td style="text-align: left"> </td> <td style="text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">505</div></td> <td style="white-space: nowrap; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="text-align: left">2023</td> <td> </td> <td style="text-align: left"> </td> <td style="text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">512</div></td> <td style="white-space: nowrap; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="padding-bottom: 1pt; text-align: left">Thereafter</td> <td style="padding-bottom: 1pt"> </td> <td style="border-bottom: Black 1pt solid; text-align: left"> </td> <td style="border-bottom: Black 1pt solid; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">7,766</div></td> <td style="white-space: nowrap; border-bottom: Black 1pt solid; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="text-align: left; padding-left: 10pt">Total lease payments</td> <td> </td> <td style="text-align: left"> </td> <td style="text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">11,722</div></td> <td style="white-space: nowrap; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: White"> <td style="text-align: left; padding-bottom: 1pt">Less imputed interest</td> <td style="padding-bottom: 1pt"> </td> <td style="border-bottom: Black 1pt solid; text-align: left"> </td> <td style="border-bottom: Black 1pt solid; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">6,513</div></td> <td style="white-space: nowrap; border-bottom: Black 1pt solid; text-align: left"> </td> </tr> <tr style="vertical-align: bottom; background-color: rgb(204,238,255)"> <td style="padding-bottom: 2.25pt; text-align: left; padding-left: 10pt">Total</td> <td style="padding-bottom: 2.25pt"> </td> <td style="border-bottom: Black 2.25pt double; text-align: left">$</td> <td style="border-bottom: Black 2.25pt double; text-align: right"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;">5,209</div></td> <td style="white-space: nowrap; border-bottom: Black 2.25pt double; text-align: left"> </td> </tr> </table></div>