Note 4 - Notes Payable (Details Textual)	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) [Member]
Line of Credit, Current	$ 7,000,000		$ 0
First National Bank of Omaha [Member] | Line of Credit [Member]
Line of Credit Facility, Interest Rate During Period	7.69%
First National Bank of Omaha [Member] | Line of Credit and Delayed Draw Term Loan [Member]
Debt Instrument, Variable Interest Rate, at Point in Time	7.67%
Credit Agreement [Member] | First National Bank of Omaha [Member]
Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio	1.1
Debt Instrument, Covenant, Exception, Fixed Charge Coverage Ratio, Dividend Threshold	$ 5,500,000
Debt Instrument, Covenant, Maximum Cash Flow Leverage Ratio	3
Credit Agreement [Member] | First National Bank of Omaha [Member] | Maximum [Member]
Debt Instrument, Covenant, Maximum Costs Associated with Building	$ 25,000,000
Credit Agreement [Member] | First National Bank of Omaha [Member] | Term Loan [Member]
Debt Instrument, Face Amount	23,412,383
Debt Instrument, Periodic Payment, Total	$ 462,988
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Credit Agreement [Member] | First National Bank of Omaha [Member] | Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 30,000,000
Line of Credit, Current	7,000,000
Line of Credit Facility, Remaining Borrowing Capacity	23,000,000
Line of Credit Facility, Average Outstanding Amount	9,100,000	$ 0
Credit Agreement [Member] | First National Bank of Omaha [Member] | Delayed Draw Term Loan (DDTL) [Member]
Line of Credit Facility, Maximum Borrowing Capacity	75,000,000
Line of Credit Facility, Remaining Borrowing Capacity	56,000,000
Debt Instrument, Periodic Payment, Principal	226,190
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	$ 10,200,000
Line of Credit and Delayed Draw Term Loan [Member] | First National Bank of Omaha [Member]
Debt Instrument, Basis Spread on Variable Rate	2.35%
Line of Credit and Delayed Draw Term Loan [Member] | First National Bank of Omaha [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.20%