Note C - Inventories (Details Textual)	3 Months Ended
Sep. 30, 2016 USD ($)
Effect of LIFO Inventory Liquidation, Deferred Debit to Inventory	$ 236,687

The difference between estimated replacement cost and LIFO cost associated with the liquidation of LIFO inventories.

No definition available.

Name:	frd_EffectOfLifoInventoryLiquidationDeferredDebitToInventory
Namespace Prefix:	frd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration