Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 606,213	$ 706,873
Certificates of deposit	5,080,000	7,063,000
Accounts receivable - Less allowances of $140,000	5,954,474	5,529,307
Inventories, net	6,832,459	6,100,391
Prepaid income taxes	114,186	150,686
Other current assets	392,568	438,222
Total current assets	18,979,900	19,988,479
Property, Plant and Equipment:
Land and improvements	1,636,749	1,632,299
Buildings and improvements	8,246,331	8,234,182
Production equipment and other	36,154,303	35,627,443
Property, Plant and Equipment, Gross	46,037,383	45,493,924
Less accumulated depreciation	32,209,494	32,235,778
Net property, plant and equipment	13,827,889	13,258,146
Total assets	32,807,789	33,246,625
Current Liabilities:
Accounts payable	1,113,627	1,060,231
Accrued wages and salaries	682,890	701,434
Other accrued expenses	239,872	475,973
Unearned revenue and customer deposits	282,114	328,154
Total current liabilities	2,318,503	2,565,792
Deferred income taxes	945,084	921,084
Total liabilities	3,263,587	3,486,876
Shareholders' Equity:
Preferred stock, no par value, 500,000 shares authorized: none outstanding	0	0
Common stock, $1.00 par value, 4,000,000 shares authorized, 1,138,096 shares issued; 966,132 shares outstanding	1,138,096	1,138,096
Additional paid-in capital	447,134	447,134
Retained earnings	31,881,070	32,096,617
Treasury stock, 171,964 shares at cost	(3,922,098)	(3,922,098)
Total shareholders' equity	29,544,202	29,759,749
Total liabilities and shareholders' equity	$ 32,807,789	$ 33,246,625