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Note 11 - Financing Obligations (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Debt [Table Text Block] |
|  | December 31, |
(in thousands) |  | 2018 |  |  | 2017 |
Revolving Credit Facility, with interest rates from 2.50% to 2.59%, due at maturity in November 2019 |  | $ | - |  |  | $ | 5,000 |
Total Financing Obligations |  | $ | - |  |  | $ | 5,000 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration