Note 6 - Debt - Assets and Liabilities Related to Interest Rate Swap Agreement (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Interest Rate Swap [Member] \| Other Current Assets [Member] \| Not Designated as Hedging Instrument [Member]
Interest rate swap assets - current	$ 44

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant