Note 6 - Fair Value Measurements - Fair Value Measurement of Acquired Intangible Assets (Details) - Evertel Technologies, LLC [Member] $ in Thousands	6 Months Ended
	Mar. 31, 2024 USD ($)
Intangible assets from Evertel acquisition	$ 2,550
Intangible assets, gain (loss)	0
Goodwill from Evertel acquisition	2,923
Gain (loss) in goodwill	0
Fair Value, Inputs, Level 1 [Member]
Intangible assets from Evertel acquisition	0
Goodwill from Evertel acquisition	0
Fair Value, Inputs, Level 2 [Member]
Intangible assets from Evertel acquisition	0
Goodwill from Evertel acquisition	0
Fair Value, Inputs, Level 3 [Member]
Intangible assets from Evertel acquisition	2,550
Goodwill from Evertel acquisition	$ 2,923