Note 2 - Segment Information - Summary of Financial Results for Reportable Segments (Details) - USD ($)	3 Months Ended				6 Months Ended
	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2019		Dec. 31, 2018
Sales	$ 56,864,000	[1]	$ 56,532,000	[2]	$ 108,978,000	[3]	$ 108,433,000	[4]
Operating Income (Loss)	2,762,000		3,448,000	[5]	4,207,000		4,384,000	[5]
North American Segment [Member]
Sales	33,098,000	[1]	34,628,000	[2]	64,106,000	[3]	64,828,000	[4]
Operating Income (Loss)	2,547,000		3,081,000	[5]	4,751,000		3,453,000	[5]
International [Member]
Sales	23,766,000	[1]	21,904,000	[2]	44,872,000	[3]	43,605,000	[4]
Operating Income (Loss)	1,725,000		1,741,000	[5]	2,889,000		3,860,000	[5]
Unallocated [Member]
Sales		[1]		[2]		[3]		[4]
Operating Income (Loss)	$ (1,510,000)		$ (1,374,000)	[5]	$ (3,433)		$ (2,929,000)	[5]

[1] Excludes $1,049 of North American segment intercompany sales to the International segment, and $3,855 of International segment intercompany sales to the North American segment.

[2] Excludes $1,047 of North American segment intercompany sales to the International segment, and $3,744 of International segment intercompany sales to the North American segment.

[3] Excludes $2,016 of North American segment intercompany sales to the International segment, and $8,097 of International segment intercompany sales to the North American segment.

[4] Excludes $2,180 of North American segment intercompany sales to the International segment, and $7,063 of International segment intercompany sales to the North American segment.

[5] As a result of the adoption of ASU 2017-07 "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost", the respective line items in the Consolidated Statement of Operations for Fiscal 2019 have been reclassified.