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Note 14 - Shares Outstanding and Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Weighted average basic shares outstanding (in shares)	11,444		11,444		11,435		11,418		11,389		11,386		11,383		11,369		11,432		11,381		11,210
Assumed exercise of stock options and issuance of stock awards (in shares)																	8
Weighted average diluted shares outstanding (in shares)	11,444		11,446		11,435		11,418		11,391		11,386		11,390		11,369		11,440		11,381		11,210
Net income (loss)	$ (1,316)	[1]	$ 11,599	[1]	$ 15,848	[1]	$ 7,629	[1]	$ 4,187	[1]	$ 2,280	[1]	$ 4,797	[1]	$ 7,699	[1]	$ 33,759	[1]	$ 18,963	[1]	$ (1,078)
Basic earnings (loss) per share (in dollars per share)	$ (0.11)		$ 1.01		$ 1.39		$ 0.67		$ 0.37		$ 0.20		$ 0.42		$ 0.68		$ 2.95		$ 1.67		$ (0.10)
Diluted earnings (loss) per share (in dollars per share)	$ (0.11)		$ 1.01		$ 1.39		$ 0.67		$ 0.37		$ 0.20		$ 0.42		$ 0.68		$ 2.95		$ 1.67		$ (0.10)
Unvested RSUs (in shares)																	91		65		167
[1] Includes a $6.2 million tax benefit related to the U.S. Tax Cuts and Jobs Act.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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