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Note 4 - Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity Method Investments [Member] |
Notes Tables |
Equity Method Investments [Table Text Block] |
|  | Carrying Value |
At December 31, (in thousands) |  | 201 8 |  |  | 2017 |
NKD Enterprises, LLC |  | $ | -- |  |  | $ | 25 |

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