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Note 15 - 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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted average basic shares outstanding (in shares)	11,451	11,452	11,446	11,444	11,416	11,420	11,415	11,488	11,447	11,509	11,432
Assumed exercise of stock options and issuance of stock awards (in shares)									0	0	8
Weighted average diluted shares outstanding (in shares)	11,475	11,452	11,446	11,459	11,416	11,420	11,415	11,488	11,447	11,509	11,440
Net income (loss)	$ 1,786	$ (1,520)	$ (6,454)	$ 593	$ (890)	$ 591	$ 2,081	$ 2,074	$ (5,595)	$ 3,856	$ 33,759
Basic earnings (loss) per share (in dollars per share)	$ 0.16	$ (0.13)	$ (0.56)	$ 0.05	$ (0.08)	$ 0.05	$ 0.18	$ 0.18	$ (0.49)	$ 0.34	$ 2.95
Diluted earnings (loss) per share (in dollars per share)	$ 0.16	$ (0.13)	$ (0.56)	$ 0.05	$ (0.08)	$ 0.05	$ 0.18	$ 0.18	$ (0.49)	$ 0.34	$ 2.95
Unvested RSUs (in shares)									235	216	91

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