Note 15 - Stockholders' Equity (Details Textual) - USD ($)											1 Months Ended												4 Months Ended	8 Months Ended	12 Months Ended
	Sep. 02, 2022	Aug. 25, 2022	Jun. 27, 2022	Jun. 21, 2022	May 25, 2022	Mar. 25, 2022	Feb. 25, 2022	Nov. 04, 2021	Oct. 25, 2021	Jul. 26, 2021	Nov. 30, 2022	Oct. 31, 2022	Aug. 31, 2022	Jul. 31, 2022	Jun. 30, 2022	May 31, 2022	Apr. 30, 2022	Feb. 28, 2022	Jan. 31, 2022	Sep. 30, 2021	Jul. 31, 2021	Jun. 30, 2021	Dec. 31, 2020	Aug. 21, 2020	Dec. 31, 2022	Dec. 31, 2021	Nov. 30, 2023	Nov. 03, 2022
Stock Issued During Period, Shares, Acquisitions			3,522,117	371,517
Proceeds from Issuance of Common Stock	$ 85,000,000.0								$ 22,800,000														$ 92,554,000	$ 0	$ 0	$ 25,300,000
Stock Issued During Period, Shares, New Issues	3,933,376								2,530,000			2,530,000
Shares Issued, Price Per Share (in dollars per share)	$ 21.61								$ 10.00
Stock Issued During Period, Shares, Warrants and Stock Options Exercised (in shares)																									982,648	708,341
Stock Issued During Period, Shares, Warrant Exercises (in shares)																									965,588	554,073
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)																									12,000	154,268
Stock Issued During Period, Shares, Warrant Exercises																									(965,588)	(554,073)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period																									(12,000)	(154,268)
Dividends declared, per share (in dollars per share)																							$ 0		$ 0.100	$ 0.125
Dividends, Total					$ 2,600,000		$ 2,400,000													$ 2,300,000
Dividends Payable																											$ 53,000	$ 53,000
Payments of Dividends, Total										$ 9,300,000													$ (0)	$ (0)	$ 10,412,000	$ 11,593,000
Common Stock, Shares, Outstanding, Ending Balance (in shares)																									113,165,027	96,774,185
Class of Warrant or Right, Outstanding (in shares)																									8,285,272	9,500,166
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)																									$ 11.50
Quarterly Dividend [Member]
Dividends declared, per share (in dollars per share)												$ 0.025		$ 0.025			$ 0.025		$ 0.025	$ 0.025	$ 0.025
Dividends, Total		$ 2,700,000									$ 280,000	$ 2,800,000
Dividend Equivalent [Member]
Dividends, Total													$ 263,000			$ 214,000		$ 214,000
Dividends Payable													4,000			$ 2,000		$ 2,000										$ 5,000
September 2021 Dividends [Member]
Payments of Dividends, Total													31,000													$ 207,000
Special Dividend [Member]
Dividends declared, per share (in dollars per share)																					$ 0.075
July 2021 Dividends Issued [Member]
Dividends, Total													$ 125,000													$ 830,000
Share-Based Payment Arrangement, Nonemployee [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)								1,500,500							21,184							67,779
Share-Based Payment Arrangement, Employee [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)															600,000
Flat Top Operating Area [Member]
Stock Issued During Period, Shares, Acquisitions						6,960,000