Note 15 - Stockholders' Equity (Details Textual) - USD ($)													1 Months Ended																				12 Months Ended
	Jul. 19, 2023	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	Jun. 01, 2021	Nov. 30, 2023	Oct. 31, 2023	Aug. 30, 2023	Jul. 31, 2023	May 31, 2023	Apr. 30, 2023	Feb. 28, 2023	Jan. 31, 2023	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, 2023	Dec. 31, 2022	Dec. 31, 2021	Aug. 31, 2023
Stock Issued During Period, Shares, New Issues	14,835,000	3,933,376								2,530,000												2,530,000
Stock Issued During Period, Shares, Warrants and Stock Options Exercised (in shares)	420,896																																	982,648	708,341
Stock Issued During Period, Shares, Warrant Exercises (in shares)																																	350,295	970,648	554,073
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)																																	11,834	12,000	154,268
Stock Issued During Period, Shares, Acquisitions				3,522,117	371,517
Proceeds from Issuance of Common Stock	$ 150,400,000	$ 85,000,000								$ 22,800,000
Shares Issued, Price Per Share (in dollars per share)	$ 10.5	$ 21.61								$ 10
Stock Issued During Period, Shares, Warrant Exercises																																	(350,295)	(970,648)	(554,073)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period																																	(11,834)	(12,000)	(154,268)
Common Stock, Dividends, Per Share, Declared																																	$ 0.1	$ 0.1	$ 0.125
Dividends						$ 2,600,000		$ 2,400,000																						$ 2,300,000
Dividends Payable													$ 53,000
Payments of Dividends											$ 9,300,000																						$ 11,864,000	$ 10,412,000	$ 11,593,000
Common Stock, Shares, Outstanding, Ending Balance (in shares)																																	128,420,923	113,165,027
Class of Warrant or Right, Outstanding (in shares)																																	7,934,977	8,285,272
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)																																	$ 11.5
Quarterly Dividend [Member]
Common Stock, Dividends, Per Share, Declared																$ 0.025		$ 0.025		$ 0.025		$ 0.025		$ 0.025			$ 0.025		$ 0.025	$ 0.025	$ 0.025
Dividends			$ 2,700,000										348,000	$ 3,200,000		$ 3,200,000		$ 2,800,000		$ 2,800,000	$ 288,000	$ 2,800,000
Dividends Payable													$ 54,000								$ 53,000		$ 53,000
Dividend Equivalent [Member]
Dividends															$ 334,000		$ 286,000		$ 282,000				$ 481,000			$ 214,000		$ 214,000
Dividends Payable																	$ 53,000		$ 53,000																	$ 54,000
September 2021 Dividends [Member]
Payments of Dividends																																			207,000
Special Dividend [Member]
Common Stock, Dividends, Per Share, Declared																															$ 0.075
July 2021 Dividends Issued [Member]
Dividends																																			$ 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
Restricted Stock [Member] | Outside Directors [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)												67,779													58,767							21,184	58,767