Balance Sheets (Unaudited) (USD $)	May 31, 2014	May 31, 2013
Current assets:
Cash and cash equivalents	$ 3,501,822	$ 2,793,642
Accounts receivable, net	3,260,899	2,894,344
Inventory	8,752,800	8,978,302
Costs and estimated earnings in excess of billings	3,521,890	2,373,791
Other current assets	1,531,106	1,521,832
Total current assets	20,568,517	18,561,911
Maintenance and other inventory, net	730,580	836,569
Property and equipment, net	7,792,488	7,867,728
Other assets	165,903	164,568
Total assets	29,257,488	27,430,776
Current liabilities:
Accounts payable	1,786,998	1,166,162
Accrued commissions	453,130	429,839
Billings in excess of costs and estimated earnings	1,388,506	850,531
Other current liabilities	1,554,759	1,343,788
Total current liabilities	5,183,393	3,790,320
Long-term liabilities	558,485	558,485
Stockholders' Equity:
Common stock and additional paid-in capital	7,820,327	7,778,994
Retained earnings	18,194,266	17,801,960
Treasury stock - at cost	(2,498,983)	(2,498,983)
Total stockholders'equity	23,515,610	23,081,971
Total liabilities and shareholders' equity	$ 29,257,488	$ 27,430,776