Note 10 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended
	Mar. 31, 2023		Dec. 31, 2022	Sep. 30, 2022		Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2023		Mar. 31, 2022
Statement [Line Items]
Balance	$ 52,380		$ 53,329	$ 54,164		$ 59,029	$ 56,061	$ 54,324	$ 54,164		$ 54,324
Net other comprehensive loss	(231)		(1,248)	(486)		(568)	(587)	(635)	(1,965)		(1,790)
Balance	52,920		52,380	53,329		57,194	59,029	56,061	52,920		57,194
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Statement [Line Items]
Balance				3,624				6,564	3,624		6,564
Other comprehensive loss before reclassifications									(1,189)		(542)
Tax effect									250		114
Amount reclassified from AOCI									(1,299)		(1,694)
Tax effect									273		355
Net other comprehensive loss									(1,965)		(1,767)
Balance	1,659					4,797			1,659		4,797
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Statement [Line Items]
Balance				0	[1]			23	0	[1]	23
Other comprehensive loss before reclassifications									0		(13)
Tax effect									0	[1]	0
Amount reclassified from AOCI									0	[1]	(10)
Tax effect									0	[1]	0
Net other comprehensive loss									0		(23)
Balance	0	[1]				0			0	[1]	0
AOCI Attributable to Parent [Member]
Statement [Line Items]
Balance	1,890		3,138	3,624		5,365	5,952	6,587	3,624		6,587
Other comprehensive loss before reclassifications									(1,189)		(555)
Tax effect									250		114
Amount reclassified from AOCI									(1,299)		(1,704)
Tax effect									273		355
Net other comprehensive loss	(231)		(1,248)	(486)		(568)	(587)	(635)	(1,965)		(1,790)
Balance	$ 1,659		$ 1,890	$ 3,138		$ 4,797	$ 5,365	$ 5,952	$ 1,659		$ 4,797

[1] Amounts include no tax expense or benefit.