Note 4 - Acquisition and Divestiture - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Income from discontinued operations, net of income taxes		$ 895
Discontinued Operations, Disposed of by Sale [Member] \| Corvisa LLC [Member]
Recognition of gain upon release of indemnification escrow - Corvisa sale		1,020
Expenses related to discontinued operations		(125)
Income from discontinued operations, net of income taxes		$ 895

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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