Note 10 - Retirement Plans - Defined Benefit Plan Assets By Category (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Total fair value of plan assets	$ 2,611,692	$ 1,785,911
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Fair value of plan assets	112,303	79,032
Defined Benefit Plan, Equity Securities [Member]
Fair value of plan assets	890,587	581,766
Defined Benefit Plan, Debt Security [Member]
Fair value of plan assets	948,044	647,626
Employee Benefit Plan, Real Estate [Member]
Fair value of plan assets	462,270	309,543
Alternative Investment Member]
Fair value of plan assets	198,488	167,944
Fair Value, Inputs, Level 1 [Member]
Total fair value of plan assets	1,950,934	1,308,424
Fair Value, Inputs, Level 1 [Member] \| Defined Benefit Plan, Cash and Cash Equivalents [Member]
Fair value of plan assets	112,303	79,032
Fair Value, Inputs, Level 1 [Member] \| Defined Benefit Plan, Equity Securities [Member]
Fair value of plan assets	890,587	581,766
Fair Value, Inputs, Level 1 [Member] \| Defined Benefit Plan, Debt Security [Member]
Fair value of plan assets	948,044	647,626
Fair Value, Inputs, Level 1 [Member] \| Employee Benefit Plan, Real Estate [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 [Member] \| Alternative Investment Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member]
Total fair value of plan assets	660,758	477,487
Fair Value, Inputs, Level 2 [Member] \| Defined Benefit Plan, Cash and Cash Equivalents [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] \| Defined Benefit Plan, Equity Securities [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] \| Defined Benefit Plan, Debt Security [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 [Member] \| Employee Benefit Plan, Real Estate [Member]
Fair value of plan assets	462,270	309,543
Fair Value, Inputs, Level 2 [Member] \| Alternative Investment Member]
Fair value of plan assets	198,488	167,944
Fair Value, Inputs, Level 3 [Member]
Total fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] \| Defined Benefit Plan, Cash and Cash Equivalents [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] \| Defined Benefit Plan, Equity Securities [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] \| Defined Benefit Plan, Debt Security [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] \| Employee Benefit Plan, Real Estate [Member]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 [Member] \| Alternative Investment Member]
Fair value of plan assets	$ 0	$ 0