Note 1 - Overview and Summary of Significant Accounting Policies - Fair Value of Cash, Notes Receivable and Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Cash	$ 1,569	$ 1,342
Notes receivable, net	9,200	9,600
Fair Value, Inputs, Level 1 [Member]
Cash	1,569	1,342
Notes receivable, net	0	0
Accounts receivable	0	0
Total assets at fair value	1,569	1,342
Term loans payable	0	0
Line of credit	0	0
Total liabilities at fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Cash	0	0
Notes receivable, net	9,238	9,622
Accounts receivable	47,712	44,394
Total assets at fair value	56,950	54,016
Term loans payable	476	646
Line of credit	16,107	14,119
Total liabilities at fair value	16,583	14,765
Fair Value, Inputs, Level 3 [Member]
Cash	0	0
Notes receivable, net	0	0
Accounts receivable	0	0
Total assets at fair value	0	0
Term loans payable	0	0
Line of credit	0	0
Total liabilities at fair value	0	0
Reported Value Measurement [Member]
Cash	1,569	1,342
Notes receivable, net	9,238	9,622
Accounts receivable	47,712	44,394
Total assets at fair value	58,519	55,358
Term loans payable	476	646
Line of credit	16,107	14,119
Total liabilities at fair value	$ 16,583	$ 14,765