Condensed Consolidated Balance Sheets (Unaudited) - USD ($)		Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents		$ 751,534	$ 353,475
Certificates of deposit		6,814,000	8,059,000
Accounts receivable, net	[1]	6,173,784	5,323,519
Inventories, net		5,287,442	4,537,693
Prepaid income taxes			56,112
Other current assets		390,746	423,952
Total current assets		19,417,506	18,753,751
Property, Plant and Equipment:
Land		923,587	923,587
Land improvements		501,102	501,102
Buildings and improvements		7,917,521	7,333,942
Production equipment and other		34,040,928	34,447,193
Property, Plant and Equipment Gross		43,383,138	43,205,824
Less accumulated depreciation		31,058,463	30,755,266
Net property, plant and equipment		12,324,675	12,450,558
Total assets		31,742,181	31,204,309
Current Liabilities:
Accounts payable		1,352,096	703,467
Accrued wages and salaries		685,169	690,526
Other accrued expenses		477,063	604,174
Unearned revenue and customer deposits		345,295	286,133
Total current liabilities		2,859,623	2,284,300
Deferred income taxes		1,011,084	1,028,084
Total liabilities		3,870,707	3,312,384
Shareholders' Equity:
Preferred stock	[2]	0	0
Common stock	[3]	1,138,096	1,138,096
Additional paid-in capital		447,134	447,134
Retained earnings		30,208,342	30,228,793
Less: Treasury stock	[4]	3,922,098	3,922,098
Total shareholders' equity		27,871,474	27,891,925
Total liabilities and shareholders' equity		$ 31,742,181	$ 31,204,309

[1] Net of allowance of $150,000.

[2] No par value, 500,000 shares authorized, none outstanding.

[3] $1.00 par value, 4,000,000 shares authorized, 1,138,096 shares issued, 966,132 shares outstanding.

[4] At cost, 171,964 shares.