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Note 16 - Subsequent Events (Details Textual)	1 Months Ended	12 Months Ended
Note 16 - Subsequent Events (Details Textual)	Feb. 28, 2025 USD ($) MMBTU $ / shares	Dec. 31, 2024 $ / shares	Dec. 31, 2023 $ / shares	Dec. 31, 2022 $ / shares	Feb. 01, 2025 $ / MMBTU	Feb. 29, 2024 USD ($)
Common Stock, Dividends, Per Share, Declared \| $ / shares		$ 0.16	$ 0.1	$ 0.1
Subsequent Event [Member] \| Natural Gas Derivative Swap February 2025 Through February 2026 [Member[ \| Not Designated as Hedging Instrument [Member]
Derivative, Swap Type, Fixed Price (in USD per Millions of British Thermal Unit) \| $ / MMBTU					4.43
Derivative, Nonmonetary Notional Amount, Energy Measure (Millions of British Thermal Unit) \| MMBTU	30,000
O2025 Q1 Dividends [Member] \| Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared \| $ / shares	$ 0.04
Dividends	$ 5,000,000
Dividends Payable	86,000
S2025 Q1 Dividends [Member] \| Subsequent Event [Member]
Dividends	$ 538,000
Share Repurchase Program [Member]
Share Repurchase Program, Authorized, Amount						$ 75,000,000