Note 12 - Long-term Debt (Details Textual)		6 Months Ended
	Sep. 17, 2024 USD ($)	Jun. 24, 2024 USD ($)	Dec. 31, 2027	Dec. 31, 2026	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2024	May 30, 2024 USD ($)	Sep. 22, 2023 USD ($)	Sep. 21, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 06, 2021 USD ($)	Aug. 12, 2019 USD ($)
Long-Term Debt					$ 25,700,000	$ 26,500,000
Long-Term Debt, Current Maturities					2,386,624	1,201,448
First National Bank of Omaha [Member] | Link Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 15,000,000						$ 15,000,000	$ 10,000,000	$ 5,000,000			$ 40,000,000
Credit Agreement, Maximum Dividend Amount											$ 8,125,000
Long-Term Line of Credit					9,100,000	$ 9,600,000
Minimum Consolidated Leverage Ratio Requirement							3.5
Consolidated Fixed Charge Ratio Requirement						1.15
Long-Term Debt, Maturity, Year One					886,624
Long-Term Debt, Maturity, Year Two					923,257
Long-Term Debt, Maturity, Year Three					23,861,896
First National Bank of Omaha [Member] | Link Credit Facility [Member] | Forecast [Member]
Minimum Consolidated Leverage Ratio Requirement			3	3.25
First National Bank of Omaha [Member] | Link Credit Facility [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate		0.65%
First National Bank of Omaha [Member] | Link Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate		1.15%
First National Bank of Omaha [Member] | Link Credit Facility [Member] | Term Loan 1 [Member]
Debt Instrument, Face Amount												$ 30,000,000	18,000,000
Debt Instrument, Interest Rate, Stated Percentage												4.00%
Long-Term Debt, Gross		$ 30,000,000
Long-Term Debt					25,700,000	$ 26,500,000
Long-Term Debt, Current Maturities					890,000	$ 900,000
First National Bank of Omaha [Member] | Link Credit Facility [Member] | Term Loan 2 [Member]
Debt Instrument, Face Amount													$ 5,500,000
First National Bank of Omaha [Member] | Boston Omaha Broadband Credit Facility [Member]
Long-Term Line of Credit					14,000,000
Minimum Consolidated Leverage Ratio Requirement	3.5
Consolidated Fixed Charge Ratio Requirement	1.15
Long-Term Debt, Maturity, Year One					1,500,000
Long-Term Debt, Maturity, Year Two					1,500,000
Long-Term Debt, Maturity, Year Three					1,500,000
Long-Term Debt, Maturity, Year Four					1,500,000
Long-Term Debt, Maturity, Year Five					$ 8,000,000
First National Bank of Omaha [Member] | Boston Omaha Broadband Credit Facility [Member] | Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 20,000,000
Number of Operating Subsidiaries	3
Debt Instrument, Term (Year)	5 years
Debt Instrument, Term, Principle Payments (Year)	10 years
Unused Portion of Debt, Fee, Percent	0.25%
First National Bank of Omaha [Member] | Boston Omaha Broadband Credit Facility [Member] | Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.75%
First National Bank of Omaha [Member] | Boston Omaha Broadband Credit Facility [Member] | Credit Facility [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%
First National Bank of Omaha [Member] | Boston Omaha Broadband Credit Facility [Member] | Credit Facility [Member] | Minimum [Member]
Debt Instrument, Incremental Drawdowns	$ 1,000,000