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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
3 Months Ended
Jun. 30, 2011
Jun. 30, 2010
OPERATING ACTIVITIES    
Net earnings $ 1,831,411 $ 1,435,137
Adjustments to reconcile net earnings to cash provided by (used in) operating activities:    
Depreciation 458,099 466,200
Provision for deferred taxes (22,675) (13,600)
Change in postretirement benefits 19,049 23,728
Decrease (increase) in operating assets:    
Accounts receivable 1,224,754 (2,926,485)
Inventories 5,063,837 (4,127,084)
Other current assets (87,985) 75,824
Increase (decrease) in operating liabilities:    
Accounts payable and accrued expenses 1,910,438 (912,855)
Contribution to profit sharing plan 50,100 55,500
Employee compensation and related expenses (278,833) 182,159
Income taxes payable 470,482 613,957
Deferred credit for LIFO inventory replacement 82,653 94,064
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES 10,721,330 (5,033,455)
INVESTING ACTIVITIES    
Purchase of property, plant and equipment (163,970) (428,844)
Increase in cash surrender value of officers' life insurance (15,250) (14,000)
NET CASH USED IN INVESTING ACTIVITIES (179,220) (442,844)
FINANCING ACTIVITIES    
Cash dividends paid (747,939) (67,994)
Long-term debt   (13,507)
NET CASH USED IN FINANCING ACTIVITIES (747,939) (81,501)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 9,794,171 (5,557,800)
Cash and cash equivalents at beginning of period 7,210,290 19,812,881
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 17,004,461 $ 14,255,081