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Note 12 - Earnings Per Share - Computation of Net Income Per Share, Basic & Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net income available for shareholders	$ 3,920	$ (4,542)	$ 2,679	$ 1,217	$ (1,552)	$ (4,504)	$ 3,172	$ 4,662	$ 3,274	$ 1,778	$ 7,484
Weighted average outstanding shares of common stock (in shares)									4,975	4,200	3,839
Dilutive effect of stock options (in shares)									125	159	186
Fully diluted shares (in shares)									5,124	4,371	4,033
Basic earnings per share (in dollars per share)	$ 0.76	$ (0.89)	$ 0.52	$ 0.27	$ (0.37)	$ (1.03)	$ 0.76	$ 1.20	$ 0.66	$ 0.42	$ 1.95
Diluted earnings per share (in dollars per share)	$ 0.74	$ (0.89)	$ 0.51	$ 0.26	$ (0.37)	$ (1.03)	$ 0.73	$ 1.14	$ 0.64	$ 0.41	$ 1.86
Restricted Stock Units (RSUs) [Member]
Dilutive effect of shares (in shares)									10	12	8
Performance Stock Units [Member]
Dilutive effect of shares (in shares)									14	0	0

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