COMPOSITION OF CERTAIN FINANCIAL STATEMENT ITEMS (Details Narrative) - USD ($)	3 Months Ended
Sep. 30, 2021	Jun. 30, 2021
Composition Of Certain Financial Statement Items
Aggregate cost	$ 3,219,000	$ 3,204,000
Net unrealized losses	66,000	215,000
Gross unrealized losses	448,000	386,000
Gross unrealized gains	382,000	171,000
Marketable equity securities	$ 1,420,000	$ 1,224,000

The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

No definition available.

Name:	pdex_MarketableSecuritiesUnrealizedGain
Namespace Prefix:	pdex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration