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Note 7 - Revolving Line of Credit and Long-term Debt (Details Textual) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2023	Jun. 30, 2023	Jun. 30, 2021	Dec. 31, 2020
Line of Credit Facility, Maximum Borrowing Capacity				$ 100.0	$ 75.0
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 75.0		$ 75.0
Line of Credit Facility, Interest Rate During Period			6.50%
Minimum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.15%
Maximum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Line of Credit Facility, Remaining Borrowing Capacity			$ 58.5
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate				0.50%
London Interbank Offered Rate [Member]
Debt Instrument, Basis Spread on Variable Rate				1.00%
London Interbank Offered Rate [Member] \| Revolving Credit Facility [Member] \| Forecast [Member]
Debt Instrument, Basis Spread on Variable Rate		1.00%
London Interbank Offered Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate				1.00%
London Interbank Offered Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Base Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate				0.00%
Base Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Term Loan [Member]
Debt Instrument, Face Amount	$ 25.0
Debt Instrument, Annual Principal Payment	$ 3.6
Debt Instrument, Term	5 years