Note C - Inventories (Details Textual)	9 Months Ended
Dec. 31, 2016 USD ($)
Effect of LIFO Inventory Liquidation, Deferred Debit to Inventory	$ 165,841

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