Note 12 - Earnings (Loss) Per Common Share - Computation of Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2021
Net income (loss)	$ 4,637	$ (97)	$ (1,474)	$ 4,540	$ (8,242)	$ (6,768)
Less: Income allocable to unvested restricted stock	0		0	0	0
Income (loss) attributable to common shareholders for diluted earnings (loss) per share	$ 4,637		$ (1,474)	$ 4,540	$ (8,242)
Common shares used in basic earnings (loss) per share (in shares)	13,156,715		12,999,022	13,111,866	12,958,911
Common share equivalents outstanding related to RSUs (in shares)	0		0	0	0
Total weighted average common shares and common share equivalents used in diluted earnings (loss) per share (in shares)	13,156,715		12,999,022	13,111,866	12,958,911
Basic (in dollars per share)	$ 0.35		$ (0.11)	$ 0.35	$ (0.64)
Diluted (in dollars per share)	$ 0.35		$ (0.11)	$ 0.35	$ (0.64)